Bài 1. Tìm tất cả hàm $f$ sao cho $f:\mathbb{R^+} \rightarrow \mathbb{R^+}$ và thỏa:
$$f\left(\frac{y}{f(x)}\right) + x = f(xy) + f(f(x))$$
$f\left(\frac{y}{f(x)}\right) + x = f(xy) + f(f(x))$
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Started By truongphat266, 02-05-2024 - 16:10
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