Question

Помогите со 2 там нужно сделать по действием дам 20 балов

Answer 1

Ответ:

$... = 4 \frac{2}{5}$

Пошаговое объяснение:

$\small{17 \frac{7}{10} - 6 \frac{4}{5} - 6 \frac{1}{2} = 17 \frac{7}{10} - 6 \frac{8}{10} - 6 \frac{5}{10} =} \\\small{ = \frac{177}{10} - \frac{68}{10} - \frac{65}{10} = \frac{177 - 68 - 65}{10} =} \\ \small{ = \frac{177 - 133}{10} = \frac{44}{10} = 4 \frac{4}{10} = 4 \frac{2}{5} }$

По действиям:

$1) \: 17 \frac{7}{10} - 6 \frac{4}{5}$

$17 \frac{7}{10} - 6 \frac{4}{5}= 17 \frac{7}{10} - 6 \frac{8}{10} =\\= \frac{177}{10} - \frac{68}{10} = \frac{177 - 68}{10} = \\ = \frac{109}{10} = 10 \frac{9}{10}$

$2) \: 10 \frac{9}{10} - 6 \frac{1}{2}$

$10 \frac{9}{10} - 6 \frac{1}{2} = 10 \frac{9}{10} - 6 \frac{5}{10} = \\ = \frac{109}{10} - \frac{65}{10} = \frac{109 - 65}{10} = \\ = \frac{44}{10} = 4 \frac{4}{10} = 4 \frac{2}{5}$