Răspuns:
3. 40-5 = 35
20% 35 = 20/100 ×35 = 1/5 ×35 = 35/5 = 7
4. 40% 320 = 40/100 ×320 = 2/5 × 350 = 700/5 = 140
320 - 140 = 180 caiete
6. a= primele 2 poze 1/3
a³= ultima poza 1/12
