4x²+8xy=y²+xy,求x:y=?
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4x²+8xy=y²+xy,求x:y=?
![4x²+8xy=y²+xy,求x:y=?](/uploads/image/z/7935426-18-6.jpg?t=4x%26%23178%3B%2B8xy%3Dy%26%23178%3B%2Bxy%2C%E6%B1%82x%EF%BC%9Ay%3D%3F)
4x²+7xy-y²=0
4(x/y)²+7(x/y)-1=0
∴x/y=(-7±√65)/8
4(x/y)²+7(x/y)-1=0
∴x/y=(-7±√65)/8
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