Current location - Training Enrollment Network - Mathematics courses - How to do this math problem? Please explain it to me.
How to do this math problem? Please explain it to me.
1. Subtraction is the inverse of addition. An addition formula can write two subtraction formulas.

And-one addend = another addend,

Appendix+Appendix = Sum

()+9=37

37-9=28

28+6=34

Second, addend+addend = sum

One addend remains the same, the other addend adds 3, and the sum also increases by 3 accordingly.

9-6=3

37-3=34

The correct result is 34.