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X=1+3+5+.....+1001
Aflati x.


Răspuns :

1=2×0+1 3=2×1+1 ............... 1001=2×500+1 X are 501 termeni Folosim formula lui Gauss x=501×1002÷2 =501×501
calculam nr termeni (1001-1):2+1=500+1=501 termeni

(1001+1)x501:2= 1002:2x501=501x501