11(x-3)=5.5*4 7.5x+30=2.5x+100

问题描述:

11(x-3)=5.5*4 7.5x+30=2.5x+100
11(x-3)=5.5*4
7.5x+30=2.5x+100

1.11(x-3)=5.5*4
x-3=5.5*4/11
x=5.5*4/11+3
x=5
2.7.5x+30=2.5x+100
7.5x-2.5x=100+30
5x=130
x=26 明白了么