Răspuns :
1+2+3+4+...+200
(200·201):2
40200:2
20100
Formula folosita:
1+2+3+ ... +n
[n·(n+1)]:2
Salut!
1+2+3+4+.....+200=
=200×(200+1):2=
=200×201:2=
=40200:2=
=20100
1+2+3+4+...+200
(200·201):2
40200:2
20100
Formula folosita:
1+2+3+ ... +n
[n·(n+1)]:2
Salut!
1+2+3+4+.....+200=
=200×(200+1):2=
=200×201:2=
=40200:2=
=20100