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Ibalint98
a fost răspuns

S=f(1) + f(2) +... f(100) ....in care f(x) = 8x-7

Răspuns :

S=f(1)+f(2)+...+f(100)=(8*1-7)+(8*2-7)+...+(8*100-7)=8*(1+2+3+...+100)-100*7=8*100*101/2-700=40400-700=39700.