Задание 1. Найдите значение выражения: 1) 3/4 − 6/5; 7) 12/5 : 5/2; 13) 1/4 − 3/25; 19) 14/25 + 3/2.

1) \(\frac{3}{4}-\frac{6}{5}=\frac{15}{20}-\frac{24}{20}=-\frac{9}{20}\).

7) \(\frac{12}{5}:\frac{5}{2}=\frac{12}{5}\cdot\frac{2}{5}=\frac{24}{25}\).

13) \(\frac{1}{4}-\frac{3}{25}=\frac{25}{100}-\frac{12}{100}=\frac{13}{100}\).

19) \(\frac{14}{25}+\frac{3}{2}=\frac{28}{50}+\frac{75}{50}=\frac{103}{50}=2\frac{3}{50}\).

Ответ: 1) \(-\frac{9}{20}\); 7) \(\frac{24}{25}\); 13) \(\frac{13}{100}\); 19) \(2\frac{3}{50}\).