化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}
问题描述：
化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}
过程一步一步的列好
x-[y-2x-(x-y)
-9-4[2x-5(x+1)]
2x-3{y-[3x-(2y-x)]-2x}
答
x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}
=x-[y-2x-x+y] =-9-4[2x-5x-5] =2x-3{y-[3x-2y+x]-2x}
=x-y+2x+x-y =-9-8x+20x+20 =2x-3{y-3x+2y-x-2x}
=4x-2y =11+12x =2x-3y+9x-6y+3x+6x
=20x-9y