Răspunsuri

2014-10-20T15:31:27+03:00
1. S = 1+2+3................+600=
=600*601:2=
=180 300

2. S =51+52+53.............+600=
=(  600+51)(600-51+1):2=
=651*550:2=
=179 025

3. S = 3+6+9.................+600=
=(600+3)[(600-3):3+1]:2=
=603*200:2=
=60 300
ei...formule chioare
vrei si formulele?
Gabriela, uite formula standard , pe care poto s-o aplici la sumele Gaus:
a+(a+k)+(a+2k)+(a+3k)+...+m = (m+a)[(m-a):k+1]:2
poti nu poto...:)