1 51/93 * 1 5/31 = ?

$$1\frac{51}{93} \cdot 1\frac{5}{31} = \frac{144}{93} \cdot \frac{36}{31} = \frac{48}{31} \cdot \frac{36}{31} = \frac{1728}{961} = 1\frac{767}{961}$$

Ответ: 1728/961 или 1 767/961