已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值

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已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值已知x^2+y^2=26,xy=3分别求

已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值
已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值

已知x^2+y^2=26,xy=3分别求代数式（x+y)^2和（x-y)^2的值
（x+y)^2
=x^2+2xy+y^2
=26+3*2
=32
（x-y)^2
=x^2-2xy+y^2
=26-3*2
=20

x^2+y^2=26,
xy=3
(x+y)^2=32
(x-y)^2=20

(x+y)^2=x^2+2xy+y^2=26+2*3=32
(x-y)^2=x^2-2xy+y^2=26-2*3=20

(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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