已知x-y=5,xy=8则x+y=
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已知x-y=5,xy=8则x+y=已知x-y=5,xy=8则x+y=已知x-y=5,xy=8则x+y=(x+y)^2=(x-y)^2+4xy=57x+y=±√575^2+16=41X+Y=根号下41正
已知x-y=5,xy=8则x+y=
已知x-y=5,xy=8则x+y=
已知x-y=5,xy=8则x+y=
(x+y)^2=(x-y)^2+4xy=57
x+y=±√57
5^2+16=41
X+Y=根号下41
正负根号57
x-y=5 x^2-2xy+y^2=25 x^2+y^2=41
x^2+y^2+2xy=41+16=57
x+y=±√57
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