5x-2(x+2)-3[x-2(3-5x)+7]
问题描述:
5x-2(x+2)-3[x-2(3-5x)+7]
答
=5x-2x-4-3(x-6+10x+7)
=3x-4-3(11x+1)
=3x-4-33x-3
=-30x-7