Răspuns :
1)
137/12 + 133/18 = (137x3 + 133x2) / 36 = (411+266)/36 = 677/36 = 18,80(5)
2)
124/15 + 157/30 = (124x2 + 157) / 30 = (248+157) / 30 = 405/30 = 13,5
3)
273/30 + 131/30 = 404/30 = 13,4(6)
137/12 + 133/18 = (137x3 + 133x2) / 36 = (411+266)/36 = 677/36 = 18,80(5)
2)
124/15 + 157/30 = (124x2 + 157) / 30 = (248+157) / 30 = 405/30 = 13,5
3)
273/30 + 131/30 = 404/30 = 13,4(6)