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Ajutor?!?!? Ofer 15 puncte!!!!!!!!!!!!!!!!!!!!
Helppp


Ajutor Ofer 15 Puncte Helppp class=

Răspuns :

1+2+3+...............+2015=2015*2016/2=2015*1008
S=√2015*1008+2015*1007
S=√2015(1008+1007)
S=√2015²=2015