分解因式(xy+1)(x+y+xy+1)+xy

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分解因式(xy+1)(x+y+xy+1)+xy分解因式(xy+1)(x+y+xy+1)+xy分解因式(xy+1)(x+y+xy+1)+xy(xy+1)(x+y+xy+1)+xy=(xy+1)[(x+y

分解因式(xy+1)(x+y+xy+1)+xy
分解因式(xy+1)(x+y+xy+1)+xy

分解因式(xy+1)(x+y+xy+1)+xy
(xy+1)(x+y+xy+1)+xy
=(xy+1)[(x+y)+(xy+1)]+xy
=(xy+1)²+(xy+1)(x+y)+xy
=(xy+1+x)(xy+1+y)(十字相乘)
xy+1 x
×
xy+1 y