方程x^2+y^2=1跟 y+2x=-7 求(x,y)方程y=28/x^2 跟y=11-x^2 求(x,y)方程y^2-4x^2=19跟9y^2+16x^2=275 求(x,y)
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![方程x^2+y^2=1跟 y+2x=-7 求(x,y)方程y=28/x^2 跟y=11-x^2 求(x,y)方程y^2-4x^2=19跟9y^2+16x^2=275 求(x,y)](/uploads/image/z/3849290-26-0.jpg?t=%E6%96%B9%E7%A8%8Bx%5E2%2By%5E2%3D1%E8%B7%9F+y%2B2x%3D-7+%E6%B1%82%EF%BC%88x%2Cy%EF%BC%89%E6%96%B9%E7%A8%8By%3D28%2Fx%5E2+%E8%B7%9Fy%3D11-x%5E2+%E6%B1%82%EF%BC%88x%2Cy%EF%BC%89%E6%96%B9%E7%A8%8By%5E2-4x%5E2%3D19%E8%B7%9F9y%5E2%2B16x%5E2%3D275+%E6%B1%82%28x%2Cy%29)
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