1) $$(1{\frac{5}{8}}) \cdot (-\frac{6}{7}) = (\frac{8+5}{8}) \cdot (-\frac{6}{7}) = {\frac{13}{8}} \cdot (-\frac{6}{7}) = -{\frac{13 \cdot 6}{8 \cdot 7}} = -{\frac{13 \cdot 3}{4 \cdot 7}} = -{\frac{39}{28}} = -1{\frac{11}{28}}$$
Ответ: $$-1{\frac{11}{28}}$$