若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值
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若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2
若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值
若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值
若xy=1,x+y=2,求1/4x^2-1/2xy+1/4y^2的值
(x+y)^2=4
4xy=4
(x-y)^2=0
原式=1/4(x-y)^2=0