The comprehensive formula is an operation that completely writes out the calculation process, that is, the calculation that deviates from the vertical type. After studying vertical calculation, you will learn formulas that can be used for continuous calculation, such as mixed operation. When calculating mixed operations, usually only one formula is calculated at a time. Write down the process of each step.

Generally speaking, the equal sign should go forward, not align with the first line, or leave the original calculation. The main thing to master is to remember to calculate multiplication and division first, and then add and subtract. In the continuous calculation of multiplication and division, it should be calculated from left to right. When you encounter parentheses, you must first calculate the inside of parentheses.