化简x+3y分之x-y÷x²y²分之x²+6xy+9y²-x+y分之2y
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化简x+3y分之x-y÷x²y²分之x²+6xy+9y²-x+y分之2y化简x+3y分之x-y÷x²y²分之x²+6xy+9y&#
化简x+3y分之x-y÷x²y²分之x²+6xy+9y²-x+y分之2y
化简x+3y分之x-y÷x²y²分之x²+6xy+9y²-x+y分之2y
化简x+3y分之x-y÷x²y²分之x²+6xy+9y²-x+y分之2y
=(x-y)/(x+3y)×(x+3y)²/(x-y)(x+y)-2y/(x+y)
=(x+3y)/(x+y)-2y/(x+y)
=(x+3y-2y)/(x+y）
=1