3м^2=3*100^2 см^2=30000 см^2
1дм^2=1*10^2 см^2=100 см^2
3м^2 1дм^2 5см^2= 30000 см^2+ 100 см^2+ 5см^2=30105 см^2
3м^2=3*100^2 см^2=30000 см^2
1дм^2=1*10^2 см^2=100 см^2
3м^2 1дм^2 5см^2= 30000 см^2+ 100 см^2+ 5см^2=30105 см^2