x²-3xy+2y²=0,求(x²+y²)÷(xy)的值?
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x²-3xy+2y²=0,求(x²+y²)÷(xy)的值?
![x²-3xy+2y²=0,求(x²+y²)÷(xy)的值?](/uploads/image/z/17296944-24-4.jpg?t=x%26%23178%3B-3xy%2B2y%26%23178%3B%3D0%2C%E6%B1%82%28x%26%23178%3B%2By%26%23178%3B%29%C3%B7%28xy%29%E7%9A%84%E5%80%BC%3F)
即(x-y)(x-2y)=0
x=y或x=2y
x=y,则原式=(y²+y²)÷y²=2y²÷y²=2
x=2y,则原式=(4y²+y²)÷2y²=5y²÷2y²=5/2
x=y或x=2y
x=y,则原式=(y²+y²)÷y²=2y²÷y²=2
x=2y,则原式=(4y²+y²)÷2y²=5y²÷2y²=5/2
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