0.2分之x+3-0.4x-1=-2.5
问题描述:
0.2分之x+3-0.4x-1=-2.5
答
0.2分之x+3-0.5分之0.4x-1=-2.5
即5(x+3)-2(0.4x-1)=-2.5
5x+15-0.8x+2=-2.5
4.2x+17=-2.5
4.2x=-19.5
x=-195/42