➖ 减法计算器（精确小数）Subtraction Calculator
计算 a - b - c …，用十进制精确运算，避免 0.3 - 0.1 = 0.19999… 这类浮点误差；支持很长的数字。本地处理。Compute a - b - c … with exact decimal arithmetic, avoiding floating-point artefacts such as 0.3 - 0.1 = 0.19999…; very long numbers work. Processed locally.
使用说明与常见问题How-to & FAQ
「减法计算器（精确小数）」是什么？What is the Subtraction Calculator tool?
计算 a - b - c …，用十进制精确运算，避免 0.3 - 0.1 = 0.19999… 这类浮点误差；支持很长的数字。本地处理。Compute a - b - c … with exact decimal arithmetic, avoiding floating-point artefacts such as 0.3 - 0.1 = 0.19999…; very long numbers work. Processed locally.
如何使用「减法计算器（精确小数）」？How do I use the Subtraction Calculator tool?
在「减法计算器（精确小数）」中，填写「被减数」、「减数（多个用空格分隔）」等参数，结果会随输入实时计算并显示在下方。In the Subtraction Calculator: Fill in "Minuend", "Subtrahends (space separated)"; results are recalculated instantly as you type.
为什么 0.3 - 0.1 ≠ 0.2？Why is 0.3 - 0.1 not 0.2 elsewhere?
二进制浮点数不能精确表示 0.1；本页按十进制整数运算，所以结果精确。Binary floating point cannot store 0.1 exactly; this page works in decimal integers, so results are exact.
能举个计算实例吗？Can you show a worked example?
例如在「减法计算器（精确小数）」中填 被减数 = 1000.5，减数（多个用空格分隔） = 0.75，结果区显示：差：999.75；算式：1000.5 − 0.75For example, entering Minuend = 1000.5, Subtrahends (space separated) = 0.75 in the Subtraction Calculator gives: Difference: 999.75; Expression: 1000.5 − 0.75
有哪些选项可以调整？What options can I adjust?
「减法计算器（精确小数）」的设置：「被减数」默认 1000.5；「减数（多个用空格分隔）」默认 0.75。每次生成结果都按当前设置处理。Settings in the Subtraction Calculator — "Minuend" default 1000.5; "Subtrahends (space separated)" default 0.75. The result always uses the current settings.
计算精度如何？How precise are the results?
「减法计算器（精确小数）」使用 JavaScript 双精度浮点数（约 15–16 位有效数字），部分功能使用 BigInt 处理大整数。The Subtraction Calculator uses double-precision floating point (about 15–16 significant digits); some features use BigInt for large integers.
「减法计算器（精确小数）」免费吗？需要注册吗？Is the Subtraction Calculator free? Do I need an account?
「减法计算器（精确小数）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Subtraction Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.