About This Tool
What is 计算器?
A tool for evaluating math expressions directly. Supports arithmetic operations plus trigonometric functions, logarithms, exponents, and mathematical constants (pi, e). Maintains a calculation history.
How to Use
- Enter a math expression (e.g., 2+3*4, sin(pi/2)).
- Press Enter to see the result.
- View previous calculations in the history.
- Click 'Clear History' to reset.
Key Features
- Arithmetic operations with parentheses
- Trigonometric functions (sin, cos, tan), logarithms (log, ln)
- Built-in math constants (pi, e)
- Calculation history retention
Tips
- Use * for multiplication, / for division, and ** for exponentiation.
- pi equals 3.14159..., e equals 2.71828... as mathematical constants.
- Use parentheses to explicitly set operation order in complex expressions.
计算器
使用函数和常量计算数学表达式
Frequently Asked Questions
支持哪些数学函数?▼
支持的函数:sin、cos、tan(三角函数),asin、acos、atan(反三角函数),log(以10为底的对数),ln(自然对数),sqrt(平方根),abs(绝对值),ceil/floor(取整),**(幂运算)。常数pi和e也可用。
计算器遵循标准运算顺序吗?▼
是的。遵循标准数学优先级(PEMDAS/BODMAS):括号优先,然后是指数,然后是乘除(从左到右),然后是加减(从左到右)。需要时使用括号覆盖默认顺序。
如何在计算器中计算百分比?▼
数的百分比:200的15% = 200 * 0.15 = 30。百分比增加:200 * 1.15 = 230(增加15%)。百分比减少:200 * 0.85 = 170(减少15%)。或使用专门的百分比计算器获得更简单的界面。