5(2-x)=-(2x-7) 0.5x-2=0.8(2x-1.5) 2(x+0.5)-3(x-0.4)=5.6

问题描述:

5(2-x)=-(2x-7) 0.5x-2=0.8(2x-1.5) 2(x+0.5)-3(x-0.4)=5.6

5(2-x)=-(2x-7) 0.5x-2=0.8(2x-1.5) 2(x+0.5)-3(x-0.4)=5.610-5x=-2x+7 0.5x-2=1.6x-1.2 2x+1-3x+1.2=5.6-5x+2x=7-10 0.5x-1.6x=-1.2+2 2x-3x=5.6-1-1.2-3x=-3 -1.1x=0.8 -x=3.4x=1 x=-8/11 x=-3.4