己知x>0,y>0,且x²+3xy-18y²=0,求x/y与﹙y-x﹚/x的值
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己知x>0,y>0,且x²+3xy-18y²=0,求x/y与﹙y-x﹚/x的值
![己知x>0,y>0,且x²+3xy-18y²=0,求x/y与﹙y-x﹚/x的值](/uploads/image/z/20317099-67-9.jpg?t=%E5%B7%B1%E7%9F%A5x%3E0%2Cy%3E0%2C%E4%B8%94x%26%23178%3B%2B3xy-18y%26%23178%3B%3D0%2C%E6%B1%82x%EF%BC%8Fy%E4%B8%8E%EF%B9%99y%EF%BC%8Dx%EF%B9%9A%EF%BC%8Fx%E7%9A%84%E5%80%BC)
十字相乘得(x-3y)(x+6y)=0.x=3y或x=-6y .条件限制 x=3y
3 ,-2/3
3 ,-2/3
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