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已知x-y=m,xy=n,求(x+y)^2=
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已知x-y=m,xy=n,求(x+y)^2=
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答案和解析
(x+y)^2
=x^2+2xy+y^2
=x^2-2xy+y^2+4xy
=(x-y)^2+4xy
=m^2+4n
=x^2+2xy+y^2
=x^2-2xy+y^2+4xy
=(x-y)^2+4xy
=m^2+4n
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