化简1— x-y/x+2y÷x²-y²/x²+4xy+4y²

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化简1— x-y/x+2y÷x²-y²/x²+4xy+4y²
化简1— x-y/x+2y÷x²-y²/x²+4xy+4y²

化简1— x-y/x+2y÷x²-y²/x²+4xy+4y²
原式=1-(x-y)/(x+2y)*(x+2y)²/(x+y)(x-y)
=1-(x+2y)/(x+y)
=(x+y-x-2y)/(x+y)
=-y/(x+y)