Question

suma lui gaus de la astea :
S= 1+2+3+.............+100
A=1+2+3+..............+2006
B=1+2+3+..............+2005
C=1+2+3+..............+78
va rog mult dau coroana​

Answer 1

Răspuns:

100•(100+1):2=

=100:2•101=

=50•101=

=5050

2005•(2005+1):2=

=2005•2006:2=

=2005•1003=

=2 011 015

78•(78+1):2=

=78•79:2=

=79•78:2=

=79•39=

=3081

2006•(2006+1):2=

=2007•2006:2=

=2007•1003=

=2 013 021