cum calculez exercitiul: 2+4+6+...2014

Răspuns :

2 + 4 + 6 + ......... + 2014 =  1 015 056

= 2 × ( 1 + 2 + 3 + ......... + 1007 ) =

= 2 × 1007 × ( 1 + 1 007 ) / 2 =

= 1 007 × 1 008 =

= 1 015 056


2+4+6+...+2014=

=2(1+2+3+...1007)=

=2*(1007*1008)/2=

=1007*1008