Answer:

This part of the extended information mainly examines the knowledge points of elementary arithmetic:

When calculating at the same level, calculate from left to right in turn; Two-stage operation, first multiply and then divide, then add and subtract. When there are brackets, count the inside of brackets first, and then count the outside of brackets; When there are multiple brackets, count the brackets first, then the brackets inside, then the braces inside, and finally the brackets outside.

If there is a power, calculate the power first. When performing mixed operations, the numbers in parentheses are calculated first, and the parentheses are from small to large. If there is a power, calculate the power first, and then from high to low.

Formula calculation is a recursive equation calculation, which is an operation to write out the calculation process completely, that is, vertical calculation. When calculating mixed operations, it is usually to work out an expression step by step (step by step, you can't write an equal sign on the original formula), and the process of each step should be written out. Generally speaking, the equal sign should go forward and not be aligned with the first line.