Question

пишите дам 100 балов​

Answer 1

Ответ:

$\\ 2 \frac{1}{7} \times 2\frac{4}{5} + \frac{5}{7} \times 2 \frac{4}{5} = \frac{15}{7} \times \frac{14}{5} + \frac{5}{7} \times \frac{14}{5} = 3 \times 2 + 2 = 6 + 2 = 8 \\ \\ 3 \frac{5}{4} \times 2 \frac{4}{5} - 9 \frac{7}{8} \div 2 \frac{4}{5} = \frac{17}{4} \times \frac{14}{5} - \frac{79}{8} \div \frac{14}{5} = \frac{17}{2} \times \frac{7}{5} - \frac{79}{8} \times \frac{5}{14} = \frac{119}{10} - \frac{395}{112} = \frac{4689}{560} = 8 \frac{209}{560} \\ \\ \frac{1}{5} \times 2 \frac{1}{5} + \frac{1}{4} \times 2\frac{4}{5} = \frac{1}{5} \times \frac{11}{5} + \frac{1}{4} \times \frac{14}{5} = \frac{11}{25} + \frac{1}{2} \times \frac{7}{5} = \frac{11}{25} + \frac{7}{10} = \frac{57}{50} = 1 \frac{7}{50}$

Ответ : г) такого нет