已知x=3.2,y=6.8,则 x^2+2xy+y^2=?thank you!

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已知x=3.2,y=6.8,则 x^2+2xy+y^2=?thank you!
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已知x=3.2,y=6.8,则 x^2+2xy+y^2=?thank you!
已知x=3.2,y=6.8,则 x^2+2xy+y^2=?
thank you!

已知x=3.2,y=6.8,则 x^2+2xy+y^2=?thank you!
∵x+y=﹣3,xy=2%D%A ∴ x<0,y<0%D%A √﹙x/y﹚+√﹙y/x﹚%D%A =﹣√﹙xy﹚/y-√﹙xy﹚/x%D%A =﹣√﹙xy﹚﹙1/x+1/y﹚%D%A =﹣√2﹙x+y﹚/xy%D%A =﹣√2×﹙﹣3﹚/2 %D%A =3√2/2