x-y+(y2/x+y)+(x2/x-y)
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x-y+(y2/x+y)+(x2/x-y)x-y+(y2/x+y)+(x2/x-y)x-y+(y2/x+y)+(x2/x-y)x-y+(y²/x+y)+(x²/x-y)=x(x&#
x-y+(y2/x+y)+(x2/x-y)
x-y+(y2/x+y)+(x2/x-y)
x-y+(y2/x+y)+(x2/x-y)
x-y+(y²/x+y)+(x²/x-y)
=x(x²-y²)/(x²-y²)-y(x²-y²)/(x²-y²)+y²(x-y)/(x²-y²)+x²(x+y)/(x²-y²)
=(x³-xy²-x²y+y³+xy²-y³+x³+x²y)/(x²-y²)
=2x³/(x²-y²)
x2+x+y2/x+y
(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)
x-y+(y2/x+y)+(x2/x-y)
我做对了吗.x2(x-y)+y2(y-x)= x2(x-y)-y2(x-y)=x2-y2=(x+y）（x-y）
(x-y)(x2+xy+y2)-xy(y-x)
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已知x.y满足X2-y2=2xy.则x-y/x+y=?x.