In the mixed operation, if there is only addition and subtraction or only multiplication and division, it is calculated from left to right. For example, 2+ 1- 1=2, first calculate the number of 2+ 1, and then subtract 1 from the number of 2+ 1.
If the first-level operation and the second-level operation exist at the same time, the second-level operation is calculated first. If there are one, two and three operations at the same time (i.e. power, root and logarithm operations), the third operation is calculated first, and then the other two levels are calculated.
Multiplication and division calculation:
Multiply a number by the difference between two numbers. You can multiply this number by the minuend and the minuend respectively, and then subtract the product. For example: (137-125) × 8 =137× 8-125× 8 = 96.
The difference between two numbers is divided by a number, and the quotient obtained by dividing the minuend by this number can be subtracted from the quotient obtained by dividing the minuend by this number. Example: (65-39) ÷13 = 65 ÷13-39 ÷13 = 2.
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