13. a) 1/2 ; 3/4; 3/8; 3/16; 5/4; 5/8 ; 7/16; 9/8; 11/16.
b) 1/2; 2/3; 3/4
c) 1/2; 1/3; 3/4; 5/4; 5/6; 7/12
14. a) 1/2; 3/4; 3/5; 4/3; 7/6
b) 3/5; 7/10 ; 11/7 ; 13/14; 39/35
c) 3/8; 5/12; 7/30; 7/60; 23/40
d) 3/7; 5/13; 7/11.
Sper ca te-am ajutat ! Coroana?
