分解因式 20x^2-(x-10)(x-5)(x+3)(x+6)
问题描述:
分解因式 20x^2-(x-10)(x-5)(x+3)(x+6)
答
20x^2-(x-10)(x-5)(x+3)(X+6)
=20x^2-(x-10)(x+3)(x-5)(x+6)
=20x^2-(x^2-30)(x^2-30)
=20x^2-x^4+60x^2-900
=-x^4+80x^2-900
=-(x^4-80x^2+1600-700)
=-[(x^2-40)^2-700]
应该是最简了 错了可不管啊 自己检查