x+y=20 1/x+1/x=1/2 求x^2y+yx^2

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x+y=20 1/x+1/x=1/2 求x^2y+yx^2
x+y=20 1/x+1/x=1/2 求x^2y+yx^2

x+y=20 1/x+1/x=1/2 求x^2y+yx^2
x+y=20
1/x+1/y=1/2
(x+y)/(xy)=1/2;
xy=40;
x^2y+xy^2
=xy(x+y)
=40×20
=800;
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