2) \(\frac{5}{14}\cdot(\frac{15}{28}\) 3) \(\frac{12}{13}\cdot\frac{4}{39}\) 4) 12:\((\frac{-4}{5})\)= 5) \(\frac{12}{19}\cdot(-6) = 6) -1\(\frac{5}{7}\):\((\frac{-3}{4})\)

Привет! Разберем эти примеры с дробями:

1. \(\frac{5}{14} \cdot \frac{15}{28} = \frac{5 \cdot 15}{14 \cdot 28} = \frac{75}{392}\)
2. \(\frac{12}{13} \cdot \frac{4}{39} = \frac{12 \cdot 4}{13 \cdot 39} = \frac{48}{507}\)
3. \(12 : (-\frac{4}{5}) = 12 \cdot (-\frac{5}{4}) = -\frac{12 \cdot 5}{4} = -\frac{60}{4} = -15\)
4. \(\frac{12}{19} \cdot (-6) = -\frac{12 \cdot 6}{19} = -\frac{72}{19}\)
5. \(-1\frac{5}{7} : (-\frac{3}{4}) = -\frac{12}{7} : (-\frac{3}{4}) = \frac{12}{7} \cdot \frac{4}{3} = \frac{12 \cdot 4}{7 \cdot 3} = \frac{48}{21} = \frac{16}{7}\)