1. Вычислите: 1) 0,4*5-9,18 2) \(\frac{7}{12}+\frac{7}{9}\) 3) \(\frac{7}{35}-\frac{1}{10}\)

Решение:

1. \(0,4 \times 5 - 9,18 = 2 - 9,18 = -7,18\)
2. \(\frac{7}{12}+\frac{7}{9} = \frac{7 \times 3}{12 \times 3} + \frac{7 \times 4}{9 \times 4} = \frac{21}{36} + \frac{28}{36} = \frac{49}{36} = 1\frac{13}{36}\)
3. \(\frac{7}{35}-\frac{1}{10} = \frac{1}{5}-\frac{1}{10} = \frac{2}{10}-\frac{1}{10} = \frac{1}{10}\)

Ответ: 1) -7,18; 2) \(1\frac{13}{36}\); 3) \(\frac{1}{10}\).