Efectueaza urmatoarele operatii :130hm+12000m-800dam=?km 31km+45hm-700m=?dam

Răspuns :

130 hm=13km
12000m=12km
800dam=8km
13+12-8=17km

31km=3100dam
45hm=450dam
700m=70dam
3100+450-70=3420 dam