178. Выполните вычитание:

Решение:

1. \( 3,6 - 8,7 = -5,1 \)
2. \( 16,8 - (-2,6) = 16,8 + 2,6 = 19,4 \)
3. \( 0 - 7,6 = -7,6 \)
4. \( -17,9 - 10,1 = -28 \)
5. \( -4,8 - (-14,13) = -4,8 + 14,13 = 9,33 \)
6. \( 0 - (-16,2) = 16,2 \)
7. \( \frac{15}{16} - \left(-\frac{9}{24}\right) = \frac{15}{16} + \frac{9}{24} = \frac{15 \cdot 3}{16 \cdot 3} + \frac{9 \cdot 2}{24 \cdot 2} = \frac{45}{48} + \frac{18}{48} = \frac{63}{48} = \frac{21}{16} = 1\frac{5}{16} \)
8. \( \frac{7}{12} - \frac{5}{6} = \frac{7}{12} - \frac{5 \cdot 2}{6 \cdot 2} = \frac{7}{12} - \frac{10}{12} = -\frac{3}{12} = -\frac{1}{4} \)
9. \( 2\frac{1}{4} - \left(-4\frac{1}{5}\right) = 2\frac{1}{4} + 4\frac{1}{5} = \frac{9}{4} + \frac{21}{5} = \frac{9 \cdot 5}{4 \cdot 5} + \frac{21 \cdot 4}{5 \cdot 4} = \frac{45}{20} + \frac{84}{20} = \frac{129}{20} = 6\frac{9}{20} \)

Ответ: 1) -5,1; 2) 19,4; 3) -7,6; 4) -28; 5) 9,33; 6) 16,2; 7) 1\(\frac{5}{16}\); 8) -\(\frac{1}{4}\); 9) 6\(\frac{9}{20}\).