它们是规范的数学操作：加、减、乘、除。
These are the canonical, mathematical operations add, subtract, multiply, and divide.
首先可以用位运算符替代纯数学操作。
The first is to use bitwise operations instead of pure mathematical operations.
数学操作或逻辑操作必须符合某种条件。
A mathematical or logical operation must meet a certain condition.
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