Tìm tất cả các hàm $f:\mathbb{R}\to\mathbb{R}$ thỏa mãn: $$\begin{cases} f(x + 1) \ge f(x) + 1 \\ f(xy)\ge f(x)f(y)\end{cases}\; \forall x, y \in \mathbb{R}$$
\begin{cases} f(x + 1) \ge f(x) + 1 \\ f(xy)\ge f(x)f(y)\end{cases}
Started By Ego, 27-04-2016 - 10:17
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