2) 2n/m+n-m+n/m=2nm+m²-2mn+n/m(m+n)=m²+n/m²+mn=n/nm=1/m
3) 4m-2/m-2+2m+2/2-m=4m-2/m-2+2m+2/2-m=4m-2/m-2-2m+2/m-2=4m-2-2m+2/m-2=2m/m-2
2) 2n/m+n-m+n/m=2nm+m²-2mn+n/m(m+n)=m²+n/m²+mn=n/nm=1/m
3) 4m-2/m-2+2m+2/2-m=4m-2/m-2+2m+2/2-m=4m-2/m-2-2m+2/m-2=4m-2-2m+2/m-2=2m/m-2