{"id":65969,"date":"2026-07-05T08:00:39","date_gmt":"2026-07-04T23:00:39","guid":{"rendered":"https:\/\/norimen.net\/?p=65969"},"modified":"2026-07-03T00:21:07","modified_gmt":"2026-07-02T15:21:07","slug":"excel-rounding-error-ieee754-floating-point","status":"publish","type":"post","link":"https:\/\/norimen.net\/vi\/excel-rounding-error-ieee754-floating-point\/","title":{"rendered":"\u30a8\u30af\u30bb\u30eb\u306e\u7656\uff5c\u7aef\u6570\u84c4\u7a4d\u3067\u8a08\u7b97\u7d50\u679c\u304c\u305a\u308c\u308b\u7406\u7531\u3068IEEE 754\u306e\u8a71"},"content":{"rendered":"<p>Xin ch\u00e0o m\u1ecdi ng\u01b0\u1eddi.<\/p>\n<p>\u0110\u00e2y l\u00e0 Enta.<\/p>\n<p>\u6570\u91cf\u96c6\u8a08\u3092\u30a8\u30af\u30bb\u30eb\u3067\u7d44\u3093\u3067\u3044\u3066\u3001\u300c\u5168\u90e8\u8db3\u3057\u305f\u3089\u624b\u8a08\u7b97\u30681\u5186\u30ba\u30ec\u3066\u308b\u300d\u3063\u3066\u7d4c\u9a13\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>\u6cd5\u9762\u5de5\u4e8b\u306e\u7a4d\u7b97\u3067\u3082\u3001\u9762\u7a4d\u00d7\u5358\u4fa1\u00d7\u6d88\u8cbb\u7a0e\u307f\u305f\u3044\u306b\u6570\u5f0f\u3092\u91cd\u306d\u3066\u3044\u304f\u3068\u3001<strong>\u6700\u7d42\u884c\u3067\u5fc5\u305a1\u5186\u30fb1m\u00b2\u306e\u5dee\u304c\u51fa\u308b<\/strong>\u73fe\u8c61\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3001\u30a8\u30af\u30bb\u30eb\u306e\u30d0\u30b0\u3058\u3083\u306a\u304f\u3066<strong>IEEE 754\u3068\u3044\u3046\u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u4e16\u754c\u5171\u901a\u4ed5\u69d8<\/strong>\u304c\u539f\u56e0\u3067\u3059\uff57<\/p>\n<p>\u6614\u30e1\u30c1\u30e3\u30e0\u30ab\u3064\u3044\u3066\u8abf\u3079\u305f\u3053\u3068\u304c\u3042\u3063\u305f\u306e\u3067\u3001\u7686\u69d8\u306b\u3082\uff57<\/p>\n<p>\u3068\u8a00\u3063\u3066\u3082\u30a4\u30de\u30c9\u30ad\u3042\u307e\u308aExcel\u4f7f\u3063\u3066\u8a08\u7b97\u3057\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>\u79c1\u306f\u672a\u3060\u306bExcel\u6d3e\uff01<\/p>\n<p>\u30b3\u30ec\u304c\u4e00\u756a\u4f55\u3067\u3082\u51fa\u6765\u3061\u3083\u3046\u306e\u3067\u30fb\u30fb\u30fb\uff57<\/p>\n<hr \/>\n<p>Th\u00f4i, quay l\u1ea1i ch\u1ee7 \u0111\u1ec1 ch\u00ednh<\/p>\n<p>\u4eca\u56de\u306f\u3001<strong>\u30a8\u30af\u30bb\u30eb\uff08\u3068\u591a\u304f\u306e\u30bd\u30d5\u30c8\uff09\u3067\u767a\u751f\u3059\u308b\u7aef\u6570\u84c4\u7a4d\u8aa4\u5dee\u306e\u6b63\u4f53<\/strong>\u3092\u3001<strong>IEEE 754\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u4ed5\u69d8<\/strong>\u304b\u3089\u3001<\/p>\n<p><strong>ROUND\u95a2\u6570\u306b\u3088\u308b\u6b63\u3057\u3044\u56de\u907f\u65b9\u6cd5<\/strong>\u307e\u3067\u6570\u91cf\u8a08\u7b97\u3067\u30a4\u30e9\u3064\u304d\u306a\u304c\u3089\u3084\u3063\u305f\u7d4c\u9a13\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>Microsoft\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u660e\u78ba\u306b\u8a18\u8f09\u306e\u3042\u308b\u8a71\u306a\u306e\u3067\u3001\u6839\u62e0\u306f100%\u78ba\u5b9f\u3067\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65952\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/33c4f23011217a40e453d534eae43a8f.jpg\" alt=\"\u7aef\u6570\u84c4\u7a4d\u30671\u5186\u30ba\u30ec\u308b\u5178\u578b\" width=\"600\" height=\"338\" \/><\/p>\n<h2>\u30a8\u30af\u30bb\u30eb\u306e\u7656\u306e\u6b63\u4f53\uff5cIEEE 754\u4ed5\u69d8<\/h2>\n<p>\u7d50\u8ad6\u3060\u3051\u3092\u8a00\u3046\u3068\u3001<strong>\u30a8\u30af\u30bb\u30eb\u306e\u8a08\u7b97\u8aa4\u5dee\u306f\u30d0\u30b0\u3067\u306f\u306a\u304fIEEE 754\u3068\u3044\u3046\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306e\u898f\u683c\u306b\u53b3\u5bc6\u306b\u5f93\u3063\u305f\u7d50\u679c<\/strong>\u0110\u00f3 l\u00e0.<\/p>\n<p>\u306f\uff1f\u3063\u3066\u611f\u3058\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>Microsoft\u306fExcel\u306e\u8a08\u7b97\u7cbe\u5ea6\u306b\u3064\u3044\u3066\u6b21\u306e\u3088\u3046\u306b\u660e\u8a18\u3057\u3066\u3044\u307e\u3059\uff1aMicrosoft Excel\u306fIEEE 754\u4ed5\u69d8\u306b\u57fa\u3065\u3044\u3066\u8a2d\u8a08\u3055\u308c\u3066\u304a\u308a\u3001\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u683c\u7d0d\u65b9\u6cd5\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u6c7a\u5b9a\u3057\u3066\u3044\u308b\u3002Excel\u306f1.79769313486232E308\u304b\u30892.2250738585072E-308\u307e\u3067\u306e\u6570\u5024\u3092\u683c\u7d0d\u3067\u304d\u308b\u304c\u3001<strong>\u6709\u52b9\u6841\u6570\u306f15\u6841\u4ee5\u5185<\/strong>\u306b\u9650\u3089\u308c\u308b\u3002<\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/ja-jp\/office\/troubleshoot\/excel\/floating-point-arithmetic-inaccurate-result\" target=\"_blank\" rel=\"noopener\">Microsoft Learn \u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u300c\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001Excel \u3067\u4e0d\u6b63\u78ba\u306a\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u300d<\/a><\/p>\n<p>\u3064\u307e\u308a\u3001\u30a8\u30af\u30bb\u30eb\u306f\u5185\u90e8\u3067<strong>\u5168\u3066\u306e\u6570\u5024\u30922\u9032\u6570\u3067\u6271\u3063\u3066\u3044\u308b<\/strong>\u305f\u3081\u300110\u9032\u6570\u3067\u66f8\u3044\u305f\u6570\u5b57\u30922\u9032\u6570\u306b\u5909\u63db\u3059\u308b\u969b\u306b<strong>\u4e38\u3081\u8aa4\u5dee<\/strong>\u304c\u751f\u307e\u308c\u308b\u3002<\/p>\n<p>\u3053\u308c\u304c\u8a08\u7b97\u3092\u91cd\u306d\u308b\u3068\u7d2f\u7a4d\u3057\u3066\u3044\u304f\u3001\u3068\u3044\u3046\u306e\u304c\u73fe\u8c61\u306e\u672c\u8cea\u3067\u3059\u3002<\/p>\n<h3>\u306a\u305c10\u9032\u6570\u21922\u9032\u6570\u3067\u8aa4\u5dee\u304c\u51fa\u308b\u306e\u304b<\/h3>\n<p>\u300c0.1\u300d\u306e\u3088\u3046\u306a10\u9032\u6570\u3067\u6709\u9650\u306a\u6570\u304c\u3001<strong>2\u9032\u6570\u3067\u306f\u7121\u9650\u306b\u5faa\u74b0\u3059\u308b\u5c0f\u6570\u306b\u306a\u308b<\/strong>\u3053\u3068\u304c\u539f\u56e0\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>10\u9032\u6570<\/th>\n<th>2\u9032\u6570\u8868\u73fe<\/th>\n<th>\u5099\u8003<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0.5<\/td>\n<td>0.1<\/td>\n<td>\u3074\u3063\u305f\u308a\u8868\u73fe\u3067\u304d\u308b<\/td>\n<\/tr>\n<tr>\n<td>0.25<\/td>\n<td>0.01<\/td>\n<td>\u3074\u3063\u305f\u308a\u8868\u73fe\u3067\u304d\u308b<\/td>\n<\/tr>\n<tr>\n<td><strong>0.1<\/strong><\/td>\n<td><strong>0.0001100110011&#8230;\uff08\u5faa\u74b0\uff09<\/strong><\/td>\n<td><strong>\u7121\u9650\u5faa\u74b0\u3001\u4e38\u3081\u8aa4\u5dee\u767a\u751f<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>0.2<\/strong><\/td>\n<td><strong>0.0011001100110&#8230;\uff08\u5faa\u74b0\uff09<\/strong><\/td>\n<td><strong>\u540c\u4e0a<\/strong><\/td>\n<\/tr>\n<tr>\n<td>0.3<\/td>\n<td>0.0100110011001&#8230;\uff08\u5faa\u74b0\uff09<\/td>\n<td>\u540c\u4e0a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>IEEE 754\u500d\u7cbe\u5ea6\uff0864bit\uff09\u3067\u306f\u3001\u3053\u306e\u7121\u9650\u5faa\u74b0\u3092<strong>\u3042\u308b\u6841\u3067\u6253\u3061\u5207\u3063\u3066\u683c\u7d0d<\/strong>\u3059\u308b\u306e\u3067\u3001\u308f\u305a\u304b\u306a\u8aa4\u5dee\uff08\u7d04 \u00b12.8 \u00d7 10\u207b\u00b9\u2077 \u7a0b\u5ea6\uff09\u304c\u751f\u307e\u308c\u307e\u3059\uff08Microsoft Learn\uff09\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65951\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/40ccd61d4c6ad09e9572b5397d3133e4.jpg\" alt=\"10\u9032\u65700.1\u30922\u9032\u6570\u5909\u63db\u3059\u308b\u3068\u7121\u9650\u5faa\u74b0\u3059\u308b\u4ed5\u7d44\u307f\" width=\"600\" height=\"338\" \/><\/p>\n<h2>\u5177\u4f53\u4f8b\uff5c\u30a8\u30af\u30bb\u30eb\u3067\u8d77\u3053\u308b\u5178\u578b\u7684\u306a\u30ba\u30ec<\/h2>\n<h3>\u524d\u63d0\u77e5\u8b58\uff5cTRUE \u3068 FALSE \u306e\u610f\u5473<\/h3>\n<p>\u5177\u4f53\u4f8b\u306b\u5165\u308b\u524d\u306b\u3001\u30a8\u30af\u30bb\u30eb\u306e <strong>TRUE \/ FALSE<\/strong> \u3092\u304a\u3055\u3089\u3044\u3057\u307e\u3059\u3002<\/p>\n<p>\u4eca\u66f4\u306a\u304c\u3089\u3001\u3053\u308c\u306f\u7686\u3055\u3093\u57fa\u672c\u4e2d\u306e\u57fa\u672c\u306a\u306e\u3067\u7d76\u5bfe\u899a\u3048\u3066\u304a\u304f\u3068\u30a4\u30a4\u3067\u3059\u3088\uff01<\/p>\n<p>\u30a8\u30af\u30bb\u30eb\u3067 <strong>\u300c\uff1d\u300d\u3084\u300c\uff1e\u300d\u3084\u300c\uff1c\u300d<\/strong> \u3092\u4f7f\u3046\u3068\u3001\u305d\u306e\u7d50\u679c\u304c <strong>TRUE\uff08\u771f\u30fb\u7b49\u3057\u3044\/\u6210\u308a\u7acb\u3064\uff09<\/strong> \u304b <strong>FALSE\uff08\u507d\u30fb\u7b49\u3057\u304f\u306a\u3044\/\u6210\u308a\u7acb\u305f\u306a\u3044\uff09<\/strong> \u3067\u8fd4\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6570\u5f0f<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u7d50\u679c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>\uff1d1\uff1d1<\/code><\/td>\n<td>1\u30681\u306f\u7b49\u3057\u3044\uff1f<\/td>\n<td><strong>TRUE<\/strong><\/td>\n<\/tr>\n<tr>\n<td><code>\uff1d1\uff1d2<\/code><\/td>\n<td>1\u30682\u306f\u7b49\u3057\u3044\uff1f<\/td>\n<td><strong>FALSE<\/strong><\/td>\n<\/tr>\n<tr>\n<td><code>\uff1d5\uff1e3<\/code><\/td>\n<td>5\u306f3\u3088\u308a\u5927\u304d\u3044\uff1f<\/td>\n<td><strong>TRUE<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u3064\u307e\u308a <strong>\u300c<code>\uff1dA1\uff1d0.3<\/code> \u3067 FALSE \u304c\u8fd4\u308b\u300d\uff1d\u300cA1\u306e\u4e2d\u8eab\u306f0.3\u3068\u7b49\u3057\u304f\u306a\u3044\u300d<\/strong> \u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u5ff5\u982d\u306b\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u203b\u6570\u5f0f\u306f\u8868\u8a18\u306e\u90fd\u5408\u3067\u5168\u89d2\u30a4\u30b3\u30fc\u30eb\uff08\uff1d\uff09\u3067\u8a18\u8f09\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u306b\u30a8\u30af\u30bb\u30eb\u3078\u5165\u529b\u3059\u308b\u969b\u306f\u534a\u89d2\u306e\u300c=\u300d\u306b\u76f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u4f8b1\uff5c0.1 + 0.2 \u2260 0.3 \u306e\u30df\u30b9\u30c6\u30ea\u30fc<\/h3>\n<p>\u30a8\u30af\u30bb\u30eb\u306e\u30bb\u30eb\u306b\u4ee5\u4e0b\u3092\u5165\u529b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30bb\u30eb<\/th>\n<th>\u6570\u5f0f<\/th>\n<th>\u8868\u793a\u7d50\u679c<\/th>\n<th>\u5185\u90e8\u3067\u306e\u5024<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A1<\/td>\n<td><code>\uff1d0.1\uff0b0.2<\/code><\/td>\n<td><strong>0.3<\/strong><\/td>\n<td>0.30000000000000004&#8230;<\/td>\n<\/tr>\n<tr>\n<td>A2<\/td>\n<td><code>\uff1dA1\uff1d0.3<\/code><\/td>\n<td><strong>FALSE<\/strong><\/td>\n<td>\uff08\u53b3\u5bc6\u306b\u306f\u7b49\u3057\u304f\u306a\u3044\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8868\u793a\u306f\u6b63\u3057\u3044\u300c0.3\u300d\u306a\u306e\u306b\u3001<code>\uff1dA1\uff1d0.3<\/code> \u3067\u6bd4\u8f03\u3059\u308b\u3068 <strong>FALSE \u306b\u306a\u308b<\/strong>\u3002\u3053\u308c\u304cIEEE 754\u306e\u7656\u3067\u3059\uff57\uff57\uff57<\/p>\n<p>\u30e0\u30ab\u3064\u304d\u307e\u3059\u3088\u306d\uff57<\/p>\n<h3>\u4f8b2\uff5c100\u500b\u8db3\u3059\u3068\u6574\u6570\u304b\u3089\u30ba\u30ec\u308b<\/h3>\n<p><code>\uff1dSUM(A1:A100)<\/code> \u306e\u3088\u3046\u306b\u8907\u6570\u30bb\u30eb\u3092\u5408\u7b97\u3059\u308b\u3068\u3001\u5404\u30bb\u30eb\u306e\u5fae\u5c0f\u8aa4\u5dee\u304c<strong>100\u500b\u5206\u7a4d\u307f\u4e0a\u304c\u308b<\/strong>\uff1a<\/p>\n<ul>\n<li>0.1 \u00d7 100 \u30921\u500b1\u500b\u8db3\u3057\u7b97 \u2192 9.99999999999998&#8230; \u306e\u3088\u3046\u306a\u7d50\u679c<\/li>\n<li>\u671f\u5f85\u5024\u306e <strong>10<\/strong> \u306b\u3074\u3063\u305f\u308a\u4e00\u81f4\u3057\u306a\u3044\u3053\u3068\u304c\u3042\u308b<\/li>\n<\/ul>\n<p>\u571f\u6728\u306e\u6570\u91cf\u96c6\u8a08\u3067 <strong>\u300c\u9762\u7a4d\u00d7\u5358\u4fa1\u300d\u306e100\u884c\u96c6\u8a08<\/strong> \u3092\u3059\u308b\u3068\u3001\u6700\u7d42\u884c\u3067 <strong>\u00b1\u6570\u5186\u301c\u6570\u5341\u5186\u306e\u30ba\u30ec<\/strong> \u304c\u8d77\u3053\u308b\u306e\u306f\u3053\u306e\u305f\u3081\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65953\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/cb7803b0943e6f4fc8097624033210ff.jpg\" alt=\"\u30a8\u30af\u30bb\u30eb\u306e100\u30bb\u30ebSUM\u8a08\u7b97\u3067\u7aef\u6570\u304c\u7d2f\u7a4d\u3057\u3066\u6574\u6570\u304b\u3089\u30ba\u30ec\u308b\u4f8b\uff5c\u6570\u91cf\u96c6\u8a08\u306e\u5178\u578b\u30a8\u30e9\u30fc]\" width=\"600\" height=\"338\" \/><\/p>\n<h3>\u4f8b3\uff5c\u6cd5\u9762\u9762\u7a4d\u8a08\u7b97\u306e\u7aef\u6570\u84c4\u7a4d\uff08\u6cd5\u9762\u73fe\u5834\u3042\u308b\u3042\u308b\uff09<\/h3>\n<p>\u5177\u4f53\u7684\u306b\u6cd5\u9762\u5de5\u4e8b\u306e\u9762\u7a4d\u8a08\u7b97\u3067\u8d77\u3053\u308a\u3084\u3059\u3044\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n<ul>\n<li>\u6cd5\u67a0\u5de5\uff1a<strong>Excel\u3067\u5e73\u65b9\u6839\u3064\u304b\u3063\u3066\u9762\u7a4d\u8a08\u7b97\u3057\u305d\u308c\u3092\u8db3\u3057\u3066\u3044\u304f<\/strong><\/li>\n<li>\u6700\u7d42 SUM \u884c\u3067\u3001\u624b\u8a08\u7b97\u3068 <strong>0.1\u301c0.5 m2\u306e\u30ba\u30ec<\/strong><\/li>\n<\/ul>\n<p>\u539f\u56e0\u304c\u5206\u304b\u3089\u305a\u534a\u65e5\u6f70\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n<p>\u6614\u30b3\u30ec\u3067\u30db\u30f3\u30c8\u306b\u4f55\u5ea6\u3082\u4f55\u5ea6\u3082\u8a08\u7b97\u3057\u3066\u8a18\u61b6\u3042\u308a\u307e\u3059\uff01\uff57<\/p>\n<h2>\u56de\u907f\u7b56\uff5cROUND\u95a2\u6570\u3067\u90fd\u5ea6\u4e38\u3081\u308b<\/h2>\n<h3>\u8868\u793a\u5f62\u5f0f\u306e\u300c\u5c0f\u6570\u6841\u6570\u3092\u6e1b\u3089\u3059\u300d\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206<\/h3>\n<p>\u30a8\u30af\u30bb\u30eb\u306e\u300c\u30bb\u30eb\u306e\u66f8\u5f0f\u8a2d\u5b9a\u300d\u3067\u5c0f\u6570\u6841\u6570\u3092\u6e1b\u3089\u3059\u65b9\u6cd5\u306f\u3001<\/p>\n<p><strong>\u8868\u793a\u4e0a\u3060\u3051\u4e38\u3081\u308b\u3060\u3051\u3067\u3001\u5185\u90e8\u5024\u306f\u4f9d\u7136\u3068\u3057\u3066\u8aa4\u5dee\u3092\u6301\u3063\u305f\u307e\u307e<\/strong>\u3002<\/p>\n<p>\u6b21\u306e\u8a08\u7b97\u306b\u6e21\u3059\u3068\u8aa4\u5dee\u304c\u6b8b\u3063\u305f\u307e\u307e\u306a\u306e\u3067\u3001\u6839\u672c\u89e3\u6c7a\u306b\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u771f\u306e\u89e3\u6c7a\u7b56\u306f\u3001\u95a2\u6570\u3067\u5024\u305d\u306e\u3082\u306e\u3092\u4e38\u3081\u308b<\/strong>\u3053\u3068\u3002<\/p>\n<h3>ROUND\u95a2\u6570\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u95a2\u6570<\/th>\n<th>\u52d5\u4f5c<\/th>\n<th>\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>\uff1dROUND(\u5024, \u6841\u6570)<\/code><\/td>\n<td>\u56db\u6368\u4e94\u5165<\/td>\n<td><strong>\u4e00\u822c\u7528\u9014\u30fb\u91d1\u984d\u8a08\u7b97<\/strong><\/td>\n<\/tr>\n<tr>\n<td><code>\uff1dROUNDDOWN(\u5024, \u6841\u6570)<\/code><\/td>\n<td>\u5207\u308a\u6368\u3066<\/td>\n<td>\u5b89\u5168\u5074\u306b\u5012\u3059\u7a4d\u7b97<\/td>\n<\/tr>\n<tr>\n<td><code>\uff1dROUNDUP(\u5024, \u6841\u6570)<\/code><\/td>\n<td>\u5207\u308a\u4e0a\u3052<\/td>\n<td>\u8cc7\u6750\u767a\u6ce8\u6570\u91cf\uff08\u4e0d\u8db3\u56de\u907f\uff09<\/td>\n<\/tr>\n<tr>\n<td><code>\uff1dINT(\u5024)<\/code><\/td>\n<td>\u6574\u6570\u5316\uff08\u8ca0\u6570\u306f\u5e8a\u95a2\u6570\uff09<\/td>\n<td>\u6574\u6570\u5024\u3067\u6253\u3061\u6b62\u3081\u305f\u3044\u5834\u5408<\/td>\n<\/tr>\n<tr>\n<td><code>\uff1dFLOOR(\u5024, \u5358\u4f4d)<\/code><\/td>\n<td>\u6307\u5b9a\u5358\u4f4d\u3067\u5207\u308a\u6368\u3066<\/td>\n<td>10\u5186\u5358\u4f4d\u30fb100\u5186\u5358\u4f4d\u306e\u4e38\u3081<\/td>\n<\/tr>\n<tr>\n<td><code>\uff1dCEILING(\u5024, \u5358\u4f4d)<\/code><\/td>\n<td>\u6307\u5b9a\u5358\u4f4d\u3067\u5207\u308a\u4e0a\u3052<\/td>\n<td>\u540c\u4e0a\u3001\u4e0d\u8db3\u56de\u907f\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65956\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/498232aff69a45c619c4f175a977c15a.jpg\" alt=\"ROUND\u95a2\u6570\u3067\u90fd\u5ea6\u4e38\u3081\u3066\u7aef\u6570\u3092\u6d88\u3059\u6b63\u3057\u3044\u3084\u308a\u65b9\uff5c\u91d1\u984d\u8a08\u7b97\u306e\u624b\u9806\" width=\"600\" height=\"338\" \/><\/p>\n<h3>\u7a4d\u7b97\u3084\u8a66\u7b97\u3067\u306f\u5fc5\u305a\u3053\u3046\u3084\u3063\u3066\uff01<\/h3>\n<p>\u5de5\u4e8b\u306e\u7a4d\u7b97\u30fb\u8a66\u7b97\u3067\u79c1\u304c\u3084\u3063\u3066\u3044\u308b\u306e\u306f\u6b21\u306e\u6d41\u308c\uff1a<\/p>\n<ul>\n<li><strong>\u91d1\u984d\u8a08\u7b97\u306f\u5e38\u306b <code>\uff1dROUND(\u6570\u91cf*\u5358\u4fa1*1.10, 0)<\/code><\/strong> \u3067\u5186\u5358\u4f4d\u306b\u90fd\u5ea6\u4e38\u3081\u308b<\/li>\n<li><strong>\u6570\u91cf\u8a08\u7b97\uff08\u9762\u7a4d\u30fb\u4f53\u7a4d\uff09\u306f <code>\uff1dROUND(\u5024, 2)<\/code> \u3067\u5c0f\u65702\u6841\u307e\u3067<\/strong> \u4e38\u3081\u3066\u56fa\u5b9a\u3059\u308b<\/li>\n<li><strong>\u96c6\u8a08\u306e\u6700\u7d42\u884c\u3067\u518d\u8a08\u7b97\u3057\u306a\u3044<\/strong>\uff08\u9014\u4e2d\u3067\u4e38\u3081\u305f\u5024\u306e\u5358\u7d14\u5408\u8a08\uff09<\/li>\n<\/ul>\n<p>\u3053\u308c\u3067\u3001\u624b\u8a08\u7b97\u30681\u5186\u3082\u30ba\u30ec\u306a\u3044\u8a08\u7b97\u66f8\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<h2>\u300cExcel\u8a08\u7b97\u7cbe\u5ea6\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\u3082\u4f75\u7528\u3067\u304d\u308b<\/h2>\n<p>\u30a8\u30af\u30bb\u30eb\u306b\u306f <strong>\u300c\u8868\u793a\u6841\u6570\u3067\u8a08\u7b97\u3059\u308b\u300d\u3068\u3044\u3046\u30aa\u30d7\u30b7\u30e7\u30f3<\/strong>\u3082\u3042\u308a\u307e\u3059\uff08\u30d5\u30a1\u30a4\u30eb \u2192 \u30aa\u30d7\u30b7\u30e7\u30f3 \u2192 \u8a73\u7d30\u8a2d\u5b9a \u2192 \u3053\u306e\u30d6\u30c3\u30af\u3092\u8a08\u7b97\u3059\u308b\u3068\u304d\uff09\u3002<\/p>\n<p>\u3053\u308c\u3092ON\u306b\u3059\u308b\u3068\u3001<strong>\u30bb\u30eb\u306e\u8868\u793a\u5f62\u5f0f\u306b\u5f93\u3063\u3066\u5185\u90e8\u5024\u3082\u4e38\u3081\u3066\u8a08\u7b97<\/strong>\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u305f\u3060\u3057\u3001<\/p>\n<ul>\n<li>\u30d6\u30c3\u30af\u5168\u4f53\u306b\u9069\u7528\u3055\u308c\u308b\uff08\u90e8\u5206\u7684\u306b\u52b9\u304b\u305b\u3089\u308c\u306a\u3044\uff09<\/li>\n<li>\u65e2\u5b58\u306e\u8a08\u7b97\u7d50\u679c\u304c\u4e00\u6c17\u306b\u5909\u308f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b<\/li>\n<li><strong>\u30c1\u30fc\u30e0\u3067\u5171\u6709\u3059\u308b\u7a4d\u7b97\u66f8\u3067\u306f\u4f7f\u308f\u306a\u3044\u65b9\u304c\u7121\u96e3<\/strong><\/li>\n<\/ul>\n<p>\u3076\u3063\u3061\u3083\u3051\u3001\u73fe\u5b9f\u7684\u306b\u306f\u3053\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\u4f7f\u308f\u305a\u306b\u3001<strong>ROUND\u95a2\u6570\u3067\u500b\u5225\u306b\u5236\u5fa1\u3059\u308b\u65b9\u304c\u5b89\u5168<\/strong>\u3068\u3044\u3046\u65b9\u304c\u30aa\u30b9\u30b9\u30e1\u3002<\/p>\n<h2>\u30a8\u30af\u30bb\u30eb\u4ee5\u5916\u3067\u3082\u540c\u3058\uff5cIEEE 754\u6e96\u62e0\u306e\u9650\u754c<\/h2>\n<p>IEEE 754\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u8aa4\u5dee\u306f\u3001<strong>\u30a8\u30af\u30bb\u30eb\u7279\u6709\u306e\u554f\u984c\u3067\u306f\u306a\u304f\u3001Google Spreadsheet\u30fbNumbers\u30fbOpenOffice\u306a\u3069\u5168\u3066\u306e\u4e3b\u8981\u8868\u8a08\u7b97\u30bd\u30d5\u30c8\u3067\u767a\u751f<\/strong>\u3057\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001C\u8a00\u8a9e\u30fbPython\u30fbJavaScript\u30fbSQL\u306a\u3069\u3001\u307b\u3068\u3093\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3082\u540c\u3058\u4ed5\u69d8\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65958\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/221f7225f9f401a8cf2431001ad9c2fc.jpg\" alt=\"IEEE 754\u306fExcel\u4ee5\u5916\u306e\u5168\u8868\u8a08\u7b97\u30fb\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u5171\u901a\u4ed5\u69d8\uff5c\u8aa4\u5dee\u306f\u4e16\u754c\u5171\u901a\" width=\"600\" height=\"338\" \/><\/p>\n<p>N\u00f3i c\u00e1ch kh\u00e1c,<strong>\u300c\u30a8\u30af\u30bb\u30eb\u3060\u304b\u3089\u4e0d\u6b63\u78ba\u300d\u3067\u306f\u306a\u304f\u3001\u4e16\u754c\u5171\u901a\u306e\u4ed5\u69d8<\/strong>\u3002\u305d\u308c\u3092\u571f\u6728\u5c4b\u3068\u3057\u3066\u7406\u89e3\u3057\u3066\u3001ROUND\u95a2\u6570\u3092\u4f7f\u3046\u306e\u304c\u6b63\u89e3\u3067\u3059\u3002<\/p>\n<h2>\u62bc\u3055\u3048\u308b5\u3064\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8<\/h2>\n<p>\u9762\u7a4d\u8a08\u7b97\u7b49\u30fb\u6570\u91cf\u8a08\u7b97\u3067\u30a8\u30af\u30bb\u30eb\u3092\u4f7f\u3046\u6642\u306f\u3001\u6b21\u306e5\u70b9\u3092\u62bc\u3055\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li>&#x2705; <strong>\u91d1\u984d\u8a08\u7b97\u306f\u5e38\u306b <code>\uff1dROUND(\u2026,0)<\/code><\/strong> \u3067\u5186\u5358\u4f4d\u306b\u4e38\u3081\u308b<\/li>\n<li>&#x2705; <strong>\u6570\u91cf\u8a08\u7b97\u306f <code>\uff1dROUND(\u2026,2)<\/code><\/strong> \u3067\u5c0f\u65702\u6841\u56fa\u5b9a<\/li>\n<li>&#x2705; <strong>\u8868\u793a\u5f62\u5f0f\u3067\u306e\u4e38\u3081\u306f\u5185\u90e8\u5024\u3092\u5909\u3048\u306a\u3044<\/strong>\u3053\u3068\u3092\u610f\u8b58<\/li>\n<li>&#x2705; <strong><code>\uff1dA1\uff1d0.3<\/code> \u306e\u3088\u3046\u306a\u76f4\u63a5\u6bd4\u8f03\u3092\u907f\u3051\u308b<\/strong>\uff08FALSE \u5224\u5b9a\u306e\u7f60\uff09<\/li>\n<li>&#x2705; <strong>\u30c1\u30fc\u30e0\u3067\u4f7f\u3046\u7a4d\u7b97\u66f8\u3067\u306f\u300c\u7cbe\u5ea6\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\u3092\u4f7f\u308f\u306a\u3044<\/strong><\/li>\n<\/ul>\n<hr \/>\n<p>\u8ff7\u3063\u305f\u3089\u307e\u305a\u300cROUND\u95a2\u6570\u30921\u6bb5\u631f\u3080\u304b\u3069\u3046\u304b\u300d\u3092\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>1\u500bROUND\u3092\u631f\u3080\u3060\u3051\u3067\u3001IEEE 754\u8d77\u56e0\u306e\u30ba\u30ec\u306f99%\u6d88\u3048\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30af\u30bb\u30eb\u304c\u300c\u7656\u300d\u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u306f\u306a\u304f\u3001<strong>\u4e16\u754c\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306e\u7656<\/strong>\u3092\u79c1\u305f\u3061\u304c\u7406\u89e3\u3057\u3066\u4f7f\u3044\u3053\u306a\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>H\u1eb9n g\u1eb7p l\u1ea1i nh\u00e9.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"jNHHIOe3aM\"><p><a href=\"https:\/\/norimen.net\/vi\/placement-error-only-one-answer\/\">\u6253\u8a2d\u306b\u304a\u3051\u308b\u914d\u7f6e\u8aa4\u5dee\u306e\u5fc5\u8981\u6027\u3092\u554f\u308f\u308c\u308b\u304c\u3001\u7b54\u3048\u306f\u3044\u3064\u30821\u3064\uff01<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201c\u6253\u8a2d\u306b\u304a\u3051\u308b\u914d\u7f6e\u8aa4\u5dee\u306e\u5fc5\u8981\u6027\u3092\u554f\u308f\u308c\u308b\u304c\u3001\u7b54\u3048\u306f\u3044\u3064\u30821\u3064\uff01\u201d \u2014 \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e\" src=\"https:\/\/norimen.net\/placement-error-only-one-answer\/embed\/#?secret=xXGJcLD6Dc#?secret=jNHHIOe3aM\" data-secret=\"jNHHIOe3aM\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" 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