若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值
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若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值由（x+y)^2=5
若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值
若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值
若（x+y)^2=5（x-y)^2=3,求x^2+y^2的值
由（x+y)^2=5,得x^2+2xy+y^2=5 （1） 由（x-y)^2=3,得x^2-2xy+y^2=3 （2） （1）+（2）得 x^2+2xy+y^2+x^2-2xy+y^2=5+3 2（x^2+y^2）=8 x^2+y^2=4
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