Question

a) Scrieti numarul 35 ca suma de 3 nr. cinsecutive. b) 57 ca suma a 5 nr consecutive. c) 71997 ca suma a 7 nr naturale consecutive. Va rog dau coronita si 50 puncte!

Answer 1

a) a+a+1+a+2=35
3a=35-3
3a=32
a=32:3
a=10,(6)
10,(6)+11,(6)+12,(6)=35
b) a+a+1+a+2+a+3+a+4=57
5a=57-10
5a=47
a=47:5
a=9,4
9,4+10,4+11,4+12,4+13,4=57
c) a+a+1+a+2+a+3+a+4+a+5+a+6=71997
7a=71997-21
7a=71976
a=71976:7
a=10282,285
10282,285+10283,285+10284,285+10285.285+10286,285+10287,285+
 10288,285=71997