Se pricepe cineva la astea? E urgent!
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(a+b+c+d+e+f+g) /7 =10
(a+b+c+d+e+f+g) =7*10 =70
70- (1+2+3+4+5+6)= 70- 21= 49.
Verific:
1+2+3+4+5+6+49= 70