分解因式:x2y+xy2-x2-y2-3xy+2x+2y-1=________.
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解决时间 2022-01-01 09:36
- 提问者网友:雪舞兮
- 2021-12-31 20:59
分解因式:x2y+xy2-x2-y2-3xy+2x+2y-1=________.
最佳答案
- 五星知识达人网友:撞了怀
- 2021-12-31 22:11
(x+y-1)(y-1)(x-1)解析分析:当被分解的式子是四项时,应考虑运用分组分解法进行分解.本题中要考虑x2y+xy2-xy为一组,-x2-y2-2xy+2x+2y-1,再两次提取公因式和组成完全平方公式进行分解.解答:x2y+xy2-x2-y2-3xy+2x+2y-1
=x2y+xy2-xy-x2-y2-2xy+2x+2y-1
=xy(x+y-1)-[(x+y)2-2(x+y)+1]
=xy(x+y-1)-(x+y-1)2
=(x+y-1)(xy-x-y+1)
=(x+y-1)(y-1)(x-1).
故
=x2y+xy2-xy-x2-y2-2xy+2x+2y-1
=xy(x+y-1)-[(x+y)2-2(x+y)+1]
=xy(x+y-1)-(x+y-1)2
=(x+y-1)(xy-x-y+1)
=(x+y-1)(y-1)(x-1).
故
全部回答
- 1楼网友:往事埋风中
- 2021-12-31 23:06
谢谢了
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