已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值
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已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值已知x^2-xy=21,
已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值
已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值
已知x^2-xy=21,xy-y^2=-12求x^2-y^2与x^2-2xy+y^2的值
x^2-xy=21 ;
xy-y^2=-12;
两式相加的
x^2-y^2=9;
相减得
x^2-2xy+y^2=33
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