x的2次方+2xy+y的2次方分之x与x+y分之y x的2次方+4x分之x+4与x(x-5)-2(x-5)分之x-5 通分
问题描述：
x的2次方+2xy+y的2次方分之x与x+y分之y x的2次方+4x分之x+4与x(x-5)-2(x-5)分之x-5 通分
答
(1) x/(x²+2xy+y²)=x/(x+y)²
y/(x+y)=y(x+y)/(x+y)²
(2) (x+4)/(x²+4x)=(x+4)/x(x+4)=1/x=(x-2)/x(x-2)
(x-5)/[x(x-5)-2(x-5)]=(x-5)/[(x-5)(x-2)]=1/(x-2)=x/x(x-2)