(x+3)(x-4)(x+5)(x-6)+80因式分解,
问题描述:
(x+3)(x-4)(x+5)(x-6)+80因式分解,
答
答:原式=[(x+3)(x-4)][(x+5)(x-6)]+80=(x²-x-12)(x²-x-30)+80=(x²-x)²-42(x²-x)+360+80=(x²-x)²-42(x²-x)+440=(x²-x)²-42(x²-x)+(-22)×(-20)=(x²-x-...