Ответ:
Решение:
- \( 1.8 = \frac{18}{10} = \frac{9}{5} \)
- \( 1 \frac{2}{7} = \frac{9}{7} \)
- \( 1.8 + 1 \frac{2}{7} = \frac{9}{5} + \frac{9}{7} = \frac{63 + 45}{35} = \frac{108}{35} \)
- \( 1.8 - 1 \frac{2}{7} = \frac{9}{5} - \frac{9}{7} = \frac{63 - 45}{35} = \frac{18}{35} \)
- \( \frac{108}{35} : \frac{18}{35} = \frac{108}{35} \cdot \frac{35}{18} = \frac{108}{18} = 6 \)
- \( 1.5 = \frac{3}{2} \)
- \( 1 \frac{1}{3} = \frac{4}{3} \)
- \( 7.6 = \frac{76}{10} = \frac{38}{5} \)
- \( 5 \frac{1}{3} = \frac{16}{3} \)
- \( 1.5 + 1 \frac{1}{3} = \frac{3}{2} + \frac{4}{3} = \frac{9 + 8}{6} = \frac{17}{6} \)
- \( 7.6 - 5 \frac{1}{3} = \frac{38}{5} - \frac{16}{3} = \frac{114 - 80}{15} = \frac{34}{15} \)
- \( \frac{17}{6} : \frac{34}{15} = \frac{17}{6} \cdot \frac{15}{34} = \frac{1}{2} \cdot \frac{5}{2} = \frac{5}{4} = 1.25 \)
- \( 23 - 15 \frac{3}{5} = 23 - \frac{78}{5} = \frac{115 - 78}{5} = \frac{37}{5} \)
- \( 5 \frac{2}{5} = \frac{27}{5} \)
- \( \frac{37}{5} : (-\frac{27}{5}) = \frac{37}{5} \cdot (-\frac{5}{27}) = -\frac{37}{27} = -1 \frac{10}{27} \)
- \( 19 - 13 \frac{2}{3} = 19 - \frac{41}{3} = \frac{57 - 41}{3} = \frac{16}{3} \)
- \( 7 \frac{1}{9} = \frac{64}{9} \)
- \( \frac{16}{3} : (-\frac{64}{9}) = \frac{16}{3} \cdot (-\frac{9}{64}) = \frac{1}{1} \cdot (-\frac{3}{4}) = -\frac{3}{4} \)
Ответ: 1) 6; 2) 1,25; 3) -1\(\frac{10}{27}\); 4) -0,75.
