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Scrieti primi 7 ai unor siruri de nr naturale formate dupa reguli inventate de voi.Dati cel putin 5 exemple ofer 74 de puncte plus coroana
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Răspuns :

: 120 ,140 ,160,180 ,200,220 ,240 :200,210,215,220,225,230,235. 131,133,135,137,139,141,143. 120,125,130,135,140,145,150, 100,1004,108,112,116,,120,124
Adunarea unui sir de 7 numere naturale consecutive.

Ex: 1+2+3+4+5+6+7=28
      7+8+9+10+11+12+13=70

Adunarea unui sir de 7 numere naturale pare consecutive.

Ex: 2+4+6+8+10+12+14=89
     22+24+26+28+30+32+34=196

Sa se completeze sirul de numere 5;8;11,14 cu urmatorii trei termeni

5;8;11;14;17;20;23  => 5+3=8+3=11+3=14+3=17+3=20+3=23

Se considera sirul : 6;13;20;27;34....Determinati al saselea si al saptelea numar.Calculati suma numerelor .

6;13;20;27;34;41;48 => 6+7=13+7=20+7=27+7=34+7=41+7=48
6+13+20+27+34+41+48=196

Scrieti termenii din sir ,cuprinsi intre 60 si 68

60...=> 61 ; 62 ; 63 ; 64 ; 65 ; 66 ; 67  =<68