已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y²/x的值.
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已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y²/x的值.
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y²/x的值.
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y²/x的值.
x-2y/x²+xy*(x²-y²)/x²-4xy+4y²/x
=(x-2y)/x(x+y)×(x²-y²)×x/(x-2y)²
=(x-y)/(x-2y)
=(x+2x)/(x+4x)
=3/5;
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