M) $$(4\frac{8}{15} - 1\frac{1}{3}) \cdot 1\frac{7}{8} = (\frac{68}{15} - \frac{4}{3}) \cdot \frac{15}{8} = (\frac{68}{15} - \frac{20}{15}) \cdot \frac{15}{8} = \frac{48}{15} \cdot \frac{15}{8} = \frac{48 \cdot 15}{15 \cdot 8} = \frac{48}{8} = 6$$
Ответ: $$6$$