已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值
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已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值(x+y
已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值
已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值
已知x2+y2=26,xy=3,求(x+y)2和(x-y)2的值
(x+y)^2
=x^2+y^2+2xy
=26+6
=32
(x-y)^2
=x^2+y^2-2xy
=26-6
=20
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