1) б)
$$ -\frac{5}{11} \cdot \frac{33}{65} = -\frac{5 \cdot 33}{11 \cdot 65} = -\frac{5 \cdot 11 \cdot 3}{11 \cdot 5 \cdot 13} = -\frac{3}{13} $$
2) б)
$$ -5\frac{1}{3} \cdot 1\frac{1}{2} = -\frac{16}{3} \cdot \frac{3}{2} = -\frac{16 \cdot 3}{3 \cdot 2} = -\frac{16}{2} = -8 $$
3) б)
$$ -\frac{4}{5} : (-1\frac{1}{15}) = -\frac{4}{5} : (-\frac{16}{15}) = \frac{4}{5} \cdot \frac{15}{16} = \frac{4 \cdot 15}{5 \cdot 16} = \frac{4 \cdot 5 \cdot 3}{5 \cdot 4 \cdot 4} = \frac{3}{4} $$
4) б)
$$ -\frac{4}{5} : 9 = -\frac{4}{5} : \frac{9}{1} = -\frac{4}{5} \cdot \frac{1}{9} = -\frac{4 \cdot 1}{5 \cdot 9} = -\frac{4}{45} $$
Ответ:
1) б) -3/13
2) б) -8
3) б) 3/4
4) б) -4/45