数学 工具
Geometry, percentages, fractions, statistics — math utilities with formulas shown.
类别介绍
Math tools that hide their math aren't tools, they're cheating. Every calculator here shows the formula being applied — useful for students learning, professionals double-checking, and anyone who wants to understand (not just trust) the result. Coverage includes geometry, arithmetic, percentages, and combinatorics.
使用案例
- →Calculate circle and triangle areas with formula explanations.
- →Convert fractions to decimals (and back) precisely.
- →Compute percentage change, markup, and margin.
- →Pick random numbers for statistical sampling.
常见问题
How precise are decimal-to-fraction conversions?
We find the simplest fraction within a tolerance you can configure (default 1e-6). 0.333333 → 1/3, 0.142857 → 1/7, etc. For repeating decimals, the tool detects the pattern when possible.
Are random numbers truly uniform?
Yes — we use crypto.getRandomValues, the same source used for cryptographic keys. Each value in your range is equally likely.
Can I solve equations?
Most math tools here are calculators, not symbolic solvers. For x² + 3x − 4 = 0 style equations, look for the quadratic equation solver specifically.