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Determinati suma a 7 numere naturale consecutive, stiind ca al treilea numar este 19... Urgent

Răspuns :

a=17
b=18
c=19
d=20
e=21
f=22
g=23
17+18+19+20+21+22+23=140
fie x primul numar
x+1 II
x+2=19 III -> x=19-2=17.
x+3 IV
x+4 V
x+5 VI
x+6 VII 
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17+18+19+20+21+22+23=140