Răspuns:
3.
anii bisecti trecuti :2004, 2008, 2012, 2016
Anul 2020 este an bisect.
ani bisecti care vor urma: 2024, 2028, 2032, 2036
4.
a) 5 min=300sec
30min = 1800 sec
1/4 min= 15 sec
2/3 min = 40 sec
1 h = 3600 sec
b)1/2 h = 30 min
1/3 h = 20 min
1/12 h = 5 min
2/5 h= 24 min
5/6 h =50 min
3/20 h = 3 min
c) 3600 min = 60 h
483840 min = 8064 h
5 zile = 120 h
1 saptamana = 168 h
