已知x^2-xy=10,xy-y^2=20,求：x^2-y^2x^-2xy+y^2

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已知x^2-xy=10,xy-y^2=20,求：x^2-y^2x^-2xy+y^2
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已知x^2-xy=10,xy-y^2=20,求：x^2-y^2x^-2xy+y^2
已知x^2-xy=10,xy-y^2=20,求：
x^2-y^2
x^-2xy+y^2

已知x^2-xy=10,xy-y^2=20,求：x^2-y^2x^-2xy+y^2
∵x^2-xy=10
∵xy-y^2=20
∴（x^2-xy）+（xy-y^2）=30
∴x^2-y^2=30
∵x^2-xy=10
∵xy-y^2=20
∴（x^2-xy）-（xy-y^2）=x^-2xy+y^2=-10
∴x^-2xy+y^2=-10

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