туральное число: 3 15 )1(-1); 6) -27. 1,4; B) -1,3-10; r) -1

а) \[ \frac{4}{9} \cdot (-\frac{3}{8}) = -\frac{4 \cdot 3}{9 \cdot 8} = -\frac{12}{72} = -\frac{1}{6} \]

б) \[ -2\frac{1}{7} \cdot 1,4 = -\frac{15}{7} \cdot \frac{14}{10} = -\frac{15 \cdot 14}{7 \cdot 10} = -\frac{210}{70} = -3 \]

в) \[ -1,3 \cdot \frac{15}{13} = -\frac{13}{10} \cdot \frac{15}{13} = -\frac{13 \cdot 15}{10 \cdot 13} = -\frac{15}{10} = -1,5 \]

г) \[ -1\frac{6}{13} \cdot \frac{1}{19} = -\frac{19}{13} \cdot \frac{1}{19} = -\frac{19 \cdot 1}{13 \cdot 19} = -\frac{1}{13} \]