1, remember the abbreviation PEMDAS. 2. First, calculate the operation in brackets. 3. Next, solve all exponential operations. 4. Then the formula contains all multiplication operations. 5. Then calculate the division. 6. Then add. 7. Next, calculate the subtraction. 8. Complete your expression. 9. done. Are you struggling because you can't master the methods and concepts of simplifying mathematical formulas? Are you still confused and have a headache? This article will teach you a simple method to help you remember how to simplify expressions.

1, remember the abbreviation PEMDAS. You can also remember this abbreviation by "Please forgive my dear aunt Sally" (please forgive my dear aunt Sally). PEMDAS actually stands for parentheses, exponential calculation, multiplication, division, addition and subtraction in turn. This order is the order you must follow when simplifying the formula, otherwise the final operation result will be wrong.

2. First, calculate the operation in brackets. Take "2x+4 (5+2)+3 2-(3+4/2)" as an example. When calculating this formula, first take out the operation in brackets and work out the result. In our example, we first take out 5+2 and 3+4/2, and then calculate 5+2=7 and 3+4/2 = 3+2. The operation in the last bracket is 3+2, not 7/2, because division takes precedence over subtraction in PEMDAS. So 3+2=5.

3. Next, solve all exponential operations. The above formula is changed to "2x+4 (7)+3 2-5", in which there is only one exponential operation, namely 3 2, and the result is 9.

4. Then the formula contains all multiplication operations. Since we have calculated the operation in brackets and the exponential operation, our formula becomes "2x+4(7) +9-5". The multiplication operations here are 2x (2x stands for 2*x) and 4(7). 2x can be kept, because x represents an unknown variable, so you can't calculate the result. Then calculate 4(7) = 4*7 = 28.

5. Then calculate the division. Division is not included in our example, so we can skip this step. However, if there is division in other formulas, division must be performed.

6. Then add. Addition is the fifth operation in PEMDAS. After the PEMD operation, our formula becomes "2x+28+9-5", and then we can calculate the addition that can be calculated. There are 2x+28 and 28+9 additions. Since the addition of 2x and 28 cannot be calculated (X is unknown), only 28+9 = 37 can be calculated to simplify the formula.

7. Next, calculate the subtraction. The last step of PEMDAS is subtraction. Through the above calculation, our formula becomes "2x+37-5". At this time, we have to calculate the subtraction that can be done. We can only work out that 37-5 is 32.

8. Complete your expression. After the above calculation, the formula becomes "2x+32". Since x is unknown, 2x cannot be added to 32, and this formula can be used as the final result.

9. done.