计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y².是初二分式的乘除法,
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计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y².是初二分式的乘除法,计算xy-y²分之x²+2x
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y².是初二分式的乘除法,
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y².
是初二分式的乘除法,
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y².是初二分式的乘除法,
原式=(x+y)²/y(x-y)*(x-y)²/y(x+y)
=(x+y)(x-y)/y²
=(x²-y²)/y²