2[3/4x-(2/3x-1)]=5/6x-33/2x-2(2/3x-1)=5/6x-33/2x-4/3x+2=5/6x-39x-8x+12=5x-18-4x=-30x=7.5
题目最好截图一下 我是这么做2[9/12x-8/12+1]=5/6x-3=2[9/12-8/12+1]=5/6-3=2×17/12x+2=5/6x-3=17/6+2=5/6x-3=2x=-5x=-2.5
