已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²2XY²)的值
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已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²2XY²)的值
已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²Y+2XY²)的值
上面打错了 这个
已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²Y+2XY²)的值
上面打错了 这个
![已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²2XY²)的值](/uploads/image/z/8780304-48-4.jpg?t=%E5%B7%B2%E7%9F%A5X%2BY%3D12%2CXY%3D9%E6%B1%82%28X%26sup2%3B%2B3XY%2B2Y%26sup2%3B%29%C3%B7%28X%26sup2%3B2XY%26sup2%3B%29%E7%9A%84%E5%80%BC)
(X²+3XY+2Y²)÷(X²Y+2XY²)
=(x+2y)(x+y)÷[xy(x+2y)]
=(x+y)/(xy)
=12/9
=4/3
=(x+2y)(x+y)÷[xy(x+2y)]
=(x+y)/(xy)
=12/9
=4/3
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