已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
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已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
2x+y)(x-y)/x²+2xy+y²
先化简右边再把x=5y代入啊,