Vrijeme: 02:05

$\log$-ično | $\log$-ical #2

Neka je f: \mathbb{R} \rightarrow \mathbb{R} funkcija definirana s f(x)=10^{2x}+10^x+1. Izračunaj \sum_{x=1}^{2021} (x-1)f(\log_{10} x).
Let f: \mathbb{R} \rightarrow \mathbb{R} be a function defined by f(x)=10^{2x}+10^x+1. Calculate the value of \sum_{x=1}^{2021} (x-1)f(\log_{10} x).