(2x²+3xy-2y²)/(x²+4xy+4y²),其中2x-y=0
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![(2x²+3xy-2y²)/(x²+4xy+4y²),其中2x-y=0](/uploads/image/z/2521281-57-1.jpg?t=%EF%BC%882x%26%23178%3B%2B3xy-2y%26%23178%3B%EF%BC%89%2F%EF%BC%88x%26%23178%3B%2B4xy%2B4y%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%AD2x-y%3D0)
(2x²+3xy-2y²)/(x²+4xy+4y²),其中2x-y=0
(2x²+3xy-2y²)/(x²+4xy+4y²),其中2x-y=0
(2x²+3xy-2y²)/(x²+4xy+4y²),其中2x-y=0
2x-y=0
y=2x
(2x²+3xy-2y²)/(x²+4xy+4y²)
=(2x-y)(x+2y)/(x+2y)²
=(2x-y)/(x+2y)
=(2x-2x)/(x+2y)
=0/(x+2y)
=0