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

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1-(x-y)/(x+2y)÷（x²-y²）/（x²+4xy+4y²）,化简
1-(x-y)/(x+2y)÷（x²-y²）/（x²+4xy+4y²）,化简
原式=1-(x-y)/(x+2y)÷(x+y)(x-y)/(x+2y)²
=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)
再问： http://zhidao.baidu.com/question/439075277.html?quesup2&oldq=1
x-y/x²÷x²-2xy+y²/xy*（xy-x²） 已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y） 化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x 1.化简：x²-4y²/x²+y²+2xy÷2y+x/x²+xy. 3x²y+xy²-[2xy²-4x²y+（x²y-2xy²） 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 化简：（2x-y)²-4(x-y)(x+y) 化简：（x²+y²/x-y）-（2xy/x-y） (-4X²Y）(-X²Y²)÷1\2XY 的三次方 化简：[(x+y)²-(x-y)²]÷2xy (-x-2y)(x²-2xy+4y²)