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问题: 分解因式

(xy+1)(x+1)(y+1)+xy

解答:

(xy+1)(x+1)(y+1)+xy
=(xy+1)[xy+(x+y)+1]+xy
=(xy+1)^2+(xy+1)(x+y)+xy
=(xy+1+x)(xy+1+y)
=(xy+x+1)(xy+y+1)