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Calculati : S=f(1)+f(2)+f(3)+...+f(35), f(x)=3X+6.

Răspuns :

f(1)=f(x)3+6=9
f(2)=f(x)3*2+6=6+6=12
f(3)=f(x)3*3+6=9+6=15
din cate vezi urca din 3 in 3
9+12+15+18+21+24+27+30+33+36+39+42+45+48+51+54+57+60+63+66+69+72+75+78+81+84+87+90+93+96+99+102+105+108+112=2101