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Cristianfirta
a fost răspuns

f:R-->R
f(x)=x+2
g:R-->R
g(x)=2x+3
Calculati suma:
S=g(1)+g(2)+...+g(50)-f(1)-f(2)-...-f(50)

Răspuns :

Bunicaluiandrei
S = 5 + 7 + 9+.......+103 - 3 - 4 - 5 - 6-7 -.......-52
S1 =( 2·1+3)+(2·2+3) +(2·3+3)+.......+(2·50+3) - 52·53/2 + 3 =
= 3·50 +2·50·51/2 - 26·53 + 3 = 150+2550 - 1378 +3 = 1325

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