1. x = 3 deoarece 3³ =27
3. (3²-1) :4+1^2010
( 9-1) :4 + 1^2010
8:4 + 1
2+1
3
5. 11+13+15+17+19 = ? (fa tu)
7. XXXVII
8. 23:7=3 rest 2
2 elevi
9. 250
10. fie x nr. timbre al Anei
2x+5 =125
2x= 125-5
2x=120
x= 120: 2
x=60 (timbre Ana)
60+5=65 (timbre Ina)