| 次方 | to the power of | | -------- | --------------------------- | | 几分之几 | n over n | | 阶乘 | factorial of | | 等差数列 | arithmetic series | | 等比数列 | geometric series | | 排列组合 | Permutation and Combination | | 根号 | square root of | | 几次根 | nth root of | | 因式分解 | factorize | Permutation排列: 16选3=16x15x14 Combination组合:16选3=16C3=16!/13!*3!