Question

Se da f(x)=2x-4 calculati f(1)+f(2)+f(3)+........+f(100)

Answer 1

Explicație pas cu pas:

f(1)=-2

f(2)=0

f(3)=2

f(100)=196

S=-2+0+...+196=>S=2+4+...+196

n=(196-2)/2+1=98

S=98(98+2)/2=4900.

Bafta!