(7.2-x)=(10.8-x)乘1/4

问题描述:

(7.2-x)=(10.8-x)乘1/4

(7.2-x)=(10.8-x)×1/4
(7.2-x)÷1/4 =(10.8-x)
28.8-4x=10.8-x
28.8=10.8-x+4x
28.8=10.8+3x
3x=28.8-10.8
x=18÷3
x=6