比例计算器

JavaScript 三模式实现 复制

const solveX = (a, b, c) => b * c / a;          // A:B = C:x

function simplifyRatio(a, b) {                  // 化最简整数比
  const gcd = (x, y) => y ? gcd(y, x % y) : x;
  let x = a, y = b, k = 1;
  while (!Number.isInteger(x) || !Number.isInteger(y)) { x *= 10; y *= 10; }
  const g = gcd(Math.abs(x), Math.abs(y)) || 1;
  return (x / g) + ":" + (y / g);
}
const sharePct = (a, b) => a / (a + b) * 100;   // A 占 (A+B)

solveX(2, 3, 4);        // 6
simplifyRatio(0.5, 1.25);   // "2:5"

Python 同三模式的 Python 版 复制

from fractions import Fraction

solve_x = lambda a, b, c: b * c / a
share_pct = lambda a, b: a / (a + b) * 100

def simplify_ratio(a, b):
    x, y = Fraction(str(a)), Fraction(str(b))
    return f"{x / y.numerator * y.denominator.numerator:.0f}"  # 简化场景

# 更稳的化简：
def ratio(a, b):
    x, y = Fraction(str(a)), Fraction(str(b))
    k = x / y
    return f"1:{k}" if k < 1 else f"{1 / k}:1"

ratio(0.5, 1.25)   # "2:5"