8. Заполните таблицу.
|
|
|
|
|
|
|
|
|
|
|---|
a |
3 |
-5 |
-2 |
6 |
\(-\frac{1}{2}\) |
\(\frac{3}{4}\) |
6,5 |
-2,4 |
\(-1\frac{1}{4}\) |
1,3 |
b |
5 |
5 |
5 |
-10 |
\(\frac{1}{4}\) |
\(-\frac{1}{8}\) |
-2,4 |
1,9 |
\(1\frac{1}{4}\) |
\(-2\frac{1}{5}\) |
a + b |
8 |
0 |
3 |
-4 |
\(-\frac{1}{4}\) |
\(\frac{5}{8}\) |
4,1 |
-0,5 |
0 |
\(-1\frac{2}{5}\) |
9. Выполните действия.
- \(12 - 8\frac{3}{7} = 11\frac{7}{7} - 8\frac{3}{7} = 3\frac{4}{7}\)
- \(5\frac{3}{8} + 7\frac{3}{5} = \frac{43}{8} + \frac{38}{5} = \frac{215 + 304}{40} = \frac{519}{40} = 12\frac{39}{40}\)
- \(6 \cdot 1\frac{1}{5} = 6 \cdot \frac{6}{5} = \frac{36}{5} = 7\frac{1}{5}\)
- \(3 : 2\frac{4}{7} = 3 : \frac{18}{7} = 3 \cdot \frac{7}{18} = \frac{21}{18} = \frac{7}{6} = 1\frac{1}{6}\)
Ответ: 9. 3⅔; 12⅙⁴; 7¹⁵; 1¹⁶