Question

Помогите! Пожалуйста! 7-ое и 8-ое

Answer 1

7.
$- \frac{66}{10} + \frac{4}{5} - \frac{5}{3} + \frac{34}{10} = - \frac{32}{10} + \frac{12}{15} - \frac{25}{15} = - \frac{32}{10} - \frac{13}{15} = - \frac{96}{30} - \frac{26}{30} = - \frac{126}{30} = - 4 \frac{6}{30} = - 4 \frac{1}{5} = - 4.2$