(xy+1)(x+1)(y+1)+xy
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(xy+1)(x+1)(y+1)+xy(xy+1)(x+1)(y+1)+xy(xy+1)(x+1)(y+1)+xy是(xy+1)(x+1)(y+1)+xy=(xy+1)[(xy+1)+(x+y)]+x
(xy+1)(x+1)(y+1)+xy
(xy+1)(x+1)(y+1)+xy
(xy+1)(x+1)(y+1)+xy
是(xy+1)(x+1)(y+1)+xy =(xy+1)[(xy+1)+(x+y)]+xy =(xy+1)^2+(x+y)(xy+1)+xy =(xy+1+x)(xy+1+y)
xy-1+x-y
(xy+1)(x+1)(y+1)+xy
(xy+1)(x+1)(y+1)+xy
(xy+1)(x+1)(y+1)+xy
分解因式(xy+1)(x+y+xy+1)+xy
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