若x-y=2,xy=3,则代数式(x-1)(y+1)的值为
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若x-y=2,xy=3,则代数式(x-1)(y+1)的值为若x-y=2,xy=3,则代数式(x-1)(y+1)的值为若x-y=2,xy=3,则代数式(x-1)(y+1)的值为(x-1)(y+1)=xy
若x-y=2,xy=3,则代数式(x-1)(y+1)的值为
若x-y=2,xy=3,则代数式(x-1)(y+1)的值为
若x-y=2,xy=3,则代数式(x-1)(y+1)的值为
(x-1)(y+1)
=xy-y+x-1
=xy+(x-y)-1
=3+2-1
=4
(x-1)(y+1)
=xy-（x-y）+1
=3-2+1
=2
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