约分如下①2a+2b/4a²-4b ²②M³+2m²+m/m²-1③2y（2y-x）⁴/6x(x-2y)³④15mn²+10m²n/5mn

约分如下①2a+2b/4a²-4b ²②M³+2m²+m/m²-1③2y（2y-x）⁴/6x(x-2y)³④15mn²+10m²n/5mn
约分如下
①2a+2b/4a²-4b ²
②M³+2m²+m/m²-1
③2y（2y-x）⁴/6x(x-2y)³
④15mn²+10m²n/5mn

约分如下①2a+2b/4a²-4b ²②M³+2m²+m/m²-1③2y（2y-x）⁴/6x(x-2y)³④15mn²+10m²n/5mn
1、=2（a+b）/4(a+b)(a-b)=1/2(a-b)
2、=m(m^2+2m+1)/(m^2-1)=m(m+1)^2/(m-1)(m+1)=m(m+1)/(m-1)
3、=y(x-2y)^4/3x(x-2y)^3=y(x-2y)/3x
4、=5mn(3n+2m)/5mn=3n+2m

1、=2（a+b）/4(a+b)(a-b)=1/2(a-b)
2、=m(m^2+2m+1)/(m^2-1)=m(m+1)^2/(m-1)(m+1)=m(m+1)/(m-1)
3、=y(x-2y)^4/3x(x-2y)^3=y(x-2y)/3x
4、=5mn(3n+2m)/5mn=3n+2m你好好分析吧！！！