化简 2x-2[3x-2(-x的平方+2x-1)-4]
问题描述:
化简 2x-2[3x-2(-x的平方+2x-1)-4]
答
原式=2x-2[3x+2(x^2-2x+1)-4]
=2x-2[3x+2(x-1)^2-4]
=2x-6x-4(x-1)^2+8
=-4[(x-1)^2+x-1-1]
=-4[(x-1)x-1]