基础计算器
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常见问题
- How do I use this online calculator?
- Click the keys or type on your keyboard — digits, + − × ÷, Enter for equals, Escape to clear, Backspace to delete. The result appears on the display and in the history below.
- Does the calculator follow order of operations?
- Yes. Multiplication and division are evaluated before addition and subtraction, and you can use parentheses to group parts of a calculation, e.g. (2 + 3) × 4 = 20.
- What do the MC, MR, M+ and M− keys do?
- They control the memory register: M+ adds the current value to memory, M− subtracts it, MR types the stored value into your calculation, and MC clears the memory. An M indicator shows when memory holds a value.
- How does the percent key work?
- The % key divides the preceding number by 100, so 50% is 0.5 and 200 × 10% is 20. To add 10% to 200, calculate 200 + 200 × 10%.
- Can I reuse an earlier calculation?
- Yes — every completed calculation is kept in the history tape below the keypad. Click any entry to load its expression back into the display.
- Why does it say “Division by zero”?
- Dividing any number by zero has no defined value in arithmetic, so the calculator shows an error instead of a misleading result. Correct the divisor and press = again.
这是什么计算器？
一款免费的屏幕计算器，用于日常运算：加、减、乘、除、百分比和平方根。它遵循标准运算顺序，支持括号，并保留最近的计算历史，点击即可重新使用。
使用方法
- 点击按键，或直接用键盘输入：数字、+ − × ÷、Enter 等号、Escape 清除。
- 使用括号分组运算：(2 + 3) × 4 = 20。
- % 将前面的数字除以 100 —— 200 × 10% = 20。
记忆键
M+ 将当前值加入记忆，M− 从记忆中减去，MR 调出记忆值，MC 清除记忆。
使用限制
- 结果精确到约 15 位有效数字。
- 除以零会显示错误提示，而不是错误的结果。