11/(х-2)=(11*5)/5(х-2)=55/(5х-10)
11/(х-2)=11х/х(х-2)=11х/(х^2-2х)
11/(х-2)=11(х+2)/((х-2)(х+2))=(11х+22)/(х^2-4)
11/(х-2)=11(5х+10)/((5х+10)(х-2)=(55х+110)/(5х^2-20)
3)
2/(b-1)=2*4/4(b-1)=8/(4b-4)
2/(b-1)=2b^2/(b^2(b-1))=2b^2/(b^3-b^2)
2/(b-1)=2(b+1)/((b-1)(b+1))=(2b+2)/(b^2-1)