作业帮约分：x^2+xy/(x+y)^2=
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约分：x^2+xy/(x+y)^2=
约分：x^2+xy/(x+y)^2=
约分：x^2+xy/(x+y)^2=
(x^2+xy)/(x+y)^2
=x(x+y)/(x+y)²
=x/(x+y)
=x/x+y
(x^2+xy)/(x+y)^2=x(x+y)/(x+y)^2=x/(x+y)
X^2-4分之X^2-2X =(X+2)(X-2)分之X(X-2) =(X+2)分之X X+Y分之X^3-XY^2 =(X+Y)分之X(X+Y)(X-Y) =X -XY
x^2-xy/xy-y^2约分
约分：x^2+xy/(x+y)^2=
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先约分,再求值:y-x分之x²-2xy+y²,其中,x=2,y=3.
X^2-4分之X^2-2X ,X+Y分之X^3-XY^2. 约分.