x^2-10xy=-100,y^2-3xy=-40,求x^2-7xy-y^2及x^2-16xy+2y^2的值
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x^2-10xy=-100,y^2-3xy=-40,求x^2-7xy-y^2及x^2-16xy+2y^2的值
![x^2-10xy=-100,y^2-3xy=-40,求x^2-7xy-y^2及x^2-16xy+2y^2的值](/uploads/image/z/17866067-59-7.jpg?t=x%5E2-10xy%3D-100%2Cy%5E2-3xy%3D-40%2C%E6%B1%82x%5E2-7xy-y%5E2%E5%8F%8Ax%5E2-16xy%2B2y%5E2%E7%9A%84%E5%80%BC)
x^2-10xy=-100,(1)
y^2-3xy=-40,(2)
(1)-(2)
x^2-7xy-y^2=-60
(1)+2(2)
x^2-16xy+2y^2=-180
y^2-3xy=-40,(2)
(1)-(2)
x^2-7xy-y^2=-60
(1)+2(2)
x^2-16xy+2y^2=-180
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