化简求值(x+2)(x-2)-(x-2)²+2x,其中x=1
问题描述:
化简求值(x+2)(x-2)-(x-2)²+2x,其中x=1
答
(x+2)(x-2)-(x-2)²+2x
=x²-4-x²-4+4x+2x
=-8+6x
=-8+6
=-2