➗ 分数计算器Fraction Calculator
分数加减乘除计算，自动约分，显示带分数和小数结果。Add, subtract, multiply and divide fractions with simplification, mixed numbers and decimals.
使用说明与常见问题How-to & FAQ
「分数计算器」是什么？What is the Fraction Calculator?
分数加减乘除计算，自动约分，显示带分数和小数结果。Add, subtract, multiply and divide fractions with simplification, mixed numbers and decimals.
如何使用「分数计算器」？How do I use the Fraction Calculator?
在「分数计算器」中，填写「分数 1」、「运算」、「分数 2」等参数，结果会随输入实时计算并显示在下方。In the Fraction Calculator: Fill in "Fraction 1", "Op", "Fraction 2"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「分数计算器」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 Fraction Calculator uses double-precision floating point (about 15–16 significant digits); some features use BigInt for large integers.
「分数计算器」免费吗？需要注册吗？Is the Fraction Calculator free? Do I need an account?
「分数计算器」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 Fraction 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.