(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2
问题描述:
(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2
答
原式=(x²-x-6)+3(x²-1)-(4x²+4x-3)
=x²-x-6+3x²-3-4x²-4x+3
=-5x-6
=-5*(-2)-6
=4