Решение:
- \( -1,7 \cdot 16 = -27,2 \)
- \( -1,3 - 7,9 = -9,2 \)
- \( -5 - (-2) + 3 = -5 + 2 + 3 = 0 \)
- \( -3 \frac{3}{5} : 2 \frac{7}{10} = -\frac{18}{5} : \frac{27}{10} = -\frac{18}{5} \cdot \frac{10}{27} = -\frac{18 \cdot 10}{5 \cdot 27} = -\frac{2 \cdot 9 \cdot 2 \cdot 5}{5 \cdot 3 \cdot 9} = -\frac{4}{3} = -1 \frac{1}{3} \)
- \( 1 \frac{1}{8} + \frac{3}{7} = \frac{9}{8} + \frac{3}{7} = \frac{9 \cdot 7 + 3 \cdot 8}{56} = \frac{63 + 24}{56} = \frac{87}{56} = 1 \frac{31}{56} \)
Ответ: 1) -27,2; 2) -9,2; 3) 0; 4) -1 \(\frac{1}{3}\); 5) 1 \(\frac{31}{56}\).