分解因式:(1)(x2+2x+3)(x2+2x+2)-30; (2)x2+2xy+y2-4x-4y-12;(3)x-y-x2+2xy-y2+2
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解决时间 2021-03-05 15:50
- 提问者网友:凉末
- 2021-03-05 11:55
分解因式:(1)(x2+2x+3)(x2+2x+2)-30; (2)x2+2xy+y2-4x-4y-12;(3)x-y-x2+2xy-y2+2
最佳答案
- 五星知识达人网友:几近狂妄
- 2021-03-05 12:37
(1)(x2+2x+3)(x2+2x+2)-30
=(x2+2x)2+5(x2+2x)-14
=(x2+2x-2)(x2+2x+7);
(2)x2+2xy+y2-4x-4y-12
=(x+y)2-4(x+y)-12
=(x+y-6)(x+y+2);
(3)x-y-x2+2xy-y2+2
=(x-y)-(x-y)2+2
=-[(x-y)2-(x-y)-2]
=-(x-y-2)(x-y+1).
=(x2+2x)2+5(x2+2x)-14
=(x2+2x-2)(x2+2x+7);
(2)x2+2xy+y2-4x-4y-12
=(x+y)2-4(x+y)-12
=(x+y-6)(x+y+2);
(3)x-y-x2+2xy-y2+2
=(x-y)-(x-y)2+2
=-[(x-y)2-(x-y)-2]
=-(x-y-2)(x-y+1).
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