Scientific Calculator Guide: Order of Operations & Functions

A scientific calculator does more than add and multiply — it evaluates expressions containing parentheses, exponents, trigonometric and logarithmic functions, and scientific notation. Understanding how it interprets your input is the key to getting correct answers.

The Order of Operations (PEMDAS)

Example: 2 + 3 × 4² is evaluated as 2 + (3 × (4²)) = 2 + (3 × 16) = 2 + 48 = 50, not 50 (from (2+3)×4²=80). When in doubt, use parentheses to make the order explicit.

Trigonometric & Logarithmic Functions

• Trig — sin, cos, tan (and their inverses asin, acos, atan). Toggle between degrees and radians.
• Logarithms — log (base 10) and ln (natural log, base e).
• Powers & roots — x², x³, xʸ, √, ʸ√x.
• Constants — π (3.14159…) and e (2.71828…).

Scientific Notation

For very large or very small numbers, use the E or EE key: 6.022E23 means 6.022 × 10²³ (Avogadro's number). The calculator handles the exponent arithmetic automatically.

Memory Keys

M+ adds the current value to memory, M− subtracts, MR recalls, and MC clears. Useful for storing intermediate results in multi-step problems.

Put It Into Practice

Type any expression — with parentheses, functions, and constants — and see the result instantly. Switch between degrees and radians with one tap.

科学计算器指南：符号表示法和有效数字

科学计算器不仅仅是加减乘除——它能够计算包含括号、指数、三角函数和对数函数以及 scientific notation 的表达式。了解它如何解读你的输入是获得正确答案的关键。

运算顺序（PEMDAS）

示例：2 + 3 × 4² 的求值过程为 2 + (3 × (4²)) = 2 + (3 × 16) = 2 + 48 = 50，而不是 50（来自 (2+3)×4²=80）。如有疑问，请使用括号来明确运算顺序。

三角函数与对数函数

• Trig — sin、cos、tan（以及它们的反函数 asin、acos、atan）。在角度和弧度之间切换。
• Logarithms — log（以 10 为底）和 ln（自然对数，以 e 为底）。
• Powers & roots — x²、x³、xʸ、√、ʸ√x。
• Constants — π（3.14159…）和 e（2.71828…）。

Scientific Notation

对于非常大或非常小的数字，使用 E 或 EE 键：6.022E23 表示 6.022 × 10²³（阿伏伽德罗常数）。计算器会自动处理指数运算。

存储键

M+ 将当前值添加到存储中，M− 减去，MR 读取，MC 清除。适用于在多步问题中存储中间结果。

动手实践

输入任何表达式——包含括号、函数和常数——即时查看结果。一键切换角度和弧度。