(1 2/3)3

$$\left(1 \frac{2}{3}\right)^3 = \left(\frac{5}{3}\right)^3 = \frac{5}{3} \cdot \frac{5}{3} \cdot \frac{5}{3} = \frac{125}{27} = 4 \frac{17}{27}$$

Ответ: 125/27 = 4 17/27