先化简(Xy-2y)(xy+2y)-(x-y)^2-x^2y^2,并求当x=1/2,y=2时的代数式的值
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先化简(Xy-2y)(xy+2y)-(x-y)^2-x^2y^2,并求当x=1/2,y=2时的代数式的值
先化简(Xy-2y)(xy+2y)-(x-y)^2-x^2y^2,并求当x=1/2,y=2时的代数式的值
先化简(Xy-2y)(xy+2y)-(x-y)^2-x^2y^2,并求当x=1/2,y=2时的代数式的值
原式=x^2y^2-4y^2-x^2+2xy-y^2-x^2y^2
=-x^2+2xy-5y^2
将x=1/2,y=2代入原式,
原式=-1/4+2-20
=-73/4
=x^2y^2-4y^2-(x^2-2xy+y^2)-x^2y^2
=x^2y^2-4y^2-x^2+2xy-y^2-x^2y^2
=-x^2-4y^2+2xy
.......
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