\[5\frac{1}{3}x\text{\ \ }\]
\[при\ \ x = 3:\]
\[5\frac{1}{3} \cdot 3 = \frac{16}{3} \cdot 3 = 16 - целое.\]
\[при\ \ x = 1:\]
\[5\frac{1}{3} \cdot 1 = 5\frac{1}{3} - дробное.\]