Bonjour
Calculer :
a. 2 min 15 s + 1 h 03 min
= 1 h (2 + 3) min 15 s
= 1 h 5 min 15 s
b.3 min 54 s + 10 s
= 3 min (54 + 10) s
= 3 min 64 s
= (3 + 1) min (64 - 60) s
= 4 min 4 s
c. 5 min 37 s - 38 s
= 5 min (37 - 38) s
= (5 - 1) min (37 + 60 - 38) s
= 4 min (97 - 38) s
= 4 min 59 s
