(2x-1)(x+2)-(x-2)²-(x+2)²先化简
问题描述:
(2x-1)(x+2)-(x-2)²-(x+2)²先化简
答
(2x-1)(x+2)-(x-2)²-(x+2)²
=2x²+4x-x-2-(x²-4x+4)-(x²+4x+4)
=2x²+4x-x-2-x²+4x-4-x²-4x-4
=3x-10