1-(x-y)/x+2y÷(x²-y²)/(x²+4xy+4y²)
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1-(x-y)/x+2y÷(x²-y²)/(x²+4xy+4y²)
1-(x-y)/x+2y÷(x²-y²)/(x²+4xy+4y²)
1-(x-y)/x+2y÷(x²-y²)/(x²+4xy+4y²)