解方程.12－2x＝4 ,4x＋1.2x＝26 ,12X6＋8x＝120.

Question

如题所述

Answer 1

12-2x=4
2x=4+12
2x=16
x=8
4x+1.2x=26
5.2x=26
x = 5
12×6＋8x=120
72+8x=120
8x=120-72
x =6