已知x²+2xy+y²\xy-y²÷A=xy+y²\x²-2xy+y²,当x=2,y=1时,求A的值
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![已知x²+2xy+y²\xy-y²÷A=xy+y²\x²-2xy+y²,当x=2,y=1时,求A的值](/uploads/image/z/2556490-58-0.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B%2B2xy%2By%26%23178%3B%5Cxy-y%26%23178%3B%C3%B7A%3Dxy%2By%26%23178%3B%5Cx%26%23178%3B-2xy%2By%26%23178%3B%2C%E5%BD%93x%3D2%2Cy%3D1%E6%97%B6%2C%E6%B1%82A%E7%9A%84%E5%80%BC)
已知x²+2xy+y²\xy-y²÷A=xy+y²\x²-2xy+y²,当x=2,y=1时,求A的值
已知x²+2xy+y²\xy-y²÷A=xy+y²\x²-2xy+y²,当x=2,y=1时,求A的值
已知x²+2xy+y²\xy-y²÷A=xy+y²\x²-2xy+y²,当x=2,y=1时,求A的值
代入
(4十4十1)/(2-1/A)=(2十1)/(4-4十1)
5/2-5A=3
5A=-1/2
A=-1/10