快,3分钟,已知x+y=2,xy=2/3求x^2y+xy^2(x-y)^2
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快,3分钟,已知x+y=2,xy=2/3求x^2y+xy^2(x-y)^2
快,3分钟,
已知x+y=2,xy=2/3求
x^2y+xy^2
(x-y)^2
快,3分钟,已知x+y=2,xy=2/3求x^2y+xy^2(x-y)^2
x^2y+xy^2=xy(x+y)=4/3
(x-y)^2=x^2+y^2-2xy
=x^2+y^2+2xy-4xy=(x+y)^2-4xy=4/3
快,3分钟,已知x+y=2,xy=2/3求x^2y+xy^2(x-y)^2
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