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How to write the process of math crossing the river in the first volume of the third grade?
The process is to learn the function of brackets, the order of operations and simple calculation methods.

This course is very important. Try not to be distracted in class, otherwise there will be great problems in mathematical calculation in the future.

Mixed operation with brackets: calculate what is in brackets first, then what is in brackets, and finally what is outside brackets.

Mixed operation without brackets: the operations at the same level are operated sequentially from left to right; Two-stage operation calculates multiplication and division first, and then addition and subtraction.

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