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计算工具/科学计算器

科学计算器

三角函数、对数等科学计算

科学计算器

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Scientific Calculator Guide

Learn how to use the scientific calculator functions

What is Scientific Calculator?

The Scientific Calculator provides advanced mathematical functions including trigonometry (sin, cos, tan), logarithms (log, ln), exponentials, powers, roots, factorials, and constants. Perfect for students, engineers, and anyone needing complex calculations.

How to Use

  1. Enter numbers and operators using the keypad
  2. Select DEG or RAD mode for angle calculations
  3. Use scientific functions like sin, cos, log, sqrt
  4. Press = to calculate, use memory functions to store values

Practical Tips

  • Toggle between DEG and RAD for trigonometric calculations
  • Use parentheses to control order of operations
  • Memory functions (MC, MR, M+, M-) help with complex calculations

Accuracy & Limitations

Calculations use JavaScript floating-point precision (about 15-17 significant digits). Results are displayed with up to 10 significant figures. Very large factorials (>170!) will return Infinity.

常见问题

DEG(度)和RAD(弧度)模式有什么区别?

DEG以度为单位计算角度(0-360°)。RAD使用弧度单位(0-2π)。转换:弧度 = 度 × π/180。例如:90° = π/2弧度。一般计算用DEG,数学/科学计算通常用RAD。

log和ln有什么区别?

log(常用对数)以10为底:log(100) = 2(10² = 100)。ln(自然对数)以e(≈2.718)为底:ln(e) = 1。科学/工程中使用ln,日常大小比较(分贝等)使用log。

什么是阶乘(n!)?

阶乘是从1到n所有正整数的乘积。例如:5! = 5×4×3×2×1 = 120。0!定义为1。在排列和组合计算中必不可少。170!以上超出JavaScript数字范围。

如何使用内存功能(MC、MR、M+、M-)?

MC(Memory Clear):清除内存。MR(Memory Recall):调用存储的值。M+:将当前值加到内存。M-:从内存减去当前值。在复杂计算中保存中间结果时很有用。

π(圆周率)和e(自然常数)的值是多少?

π ≈ 3.14159265359... 是圆周长与直径的比率。e ≈ 2.71828182846... 是自然对数的底,出现在复利计算和指数增长中。两个常数都是无限不循环的无理数。