已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?
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已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?已知x^2-xy=8,x
已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?
已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?
已知x^2-xy=8,xy-y^2=3.则x^2-y^2=?,x^2-2xy+y^2=?
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