Question

2)1/5+(-1/7)+2/9
3)-1/8+3/9+(5/36)​

Answer 1

Ответ:

$1) - \frac{5}{8} + \frac{1}{4} + \frac{7}{12} = - \frac{5}{8} + \frac{2}{8} + \frac{7}{12} = \\ = - \frac{3}{8} + \frac{7}{12} = - \frac{9}{24} + \frac{14}{24} = \\ = \frac{5}{24}$

$2) \frac{1}{5} - \frac{1}{7} + \frac{2}{9} = \frac{7}{35} - \frac{5}{35} + \frac{2}{9} = \\ \frac{2}{35} + \frac{2}{9} = \frac{18}{315} + \frac{70}{315} = \frac{88}{315}$

$3) - \frac{1}{8} + \frac{3}{9} + \frac{5}{36} = - \frac{9}{72} + \frac{24}{72} + \frac{10}{72} = \\ = \frac{25}{72}$