Вычислите:пж...оч надооо

$6 + 2 \frac{4}{7} = \frac{6}{1} + \frac{18}{7} = \frac{42}{7} + \frac{18}{7} = \frac{42 + 18}{7} = \frac{60}{7}$

$6 - 2 \frac{4}{7} = \frac{6}{1} - \frac{18}{7} = \frac{42}{7} - \frac{18}{7} = \frac{24}{7}$

$2 \frac{4}{7} - 6 = \frac{18}{7} - \frac{6}{1} = \frac{18}{7} - \frac{42}{7} = \frac{18 - 42}{7} = - \frac{24}{7}$

$- 2 \frac{4}{7} - 6 = - \frac{18}{7} - \frac{6}{1} = - \frac{18}{7} - \frac{42}{7} = \frac{ - 18 - 42}{7} = \frac{ - 60}{7} = - \frac{60}{7}$
$- 2 \frac{4}{7} = 6 \\ - \frac{18}{7} = 6$
- 2,57 ≠ 6

$- 6 + 2 \frac{4}{7} = - \frac{6}{1} + \frac{18}{7} = - \frac{42}{7} + \frac{18}{7} = - \frac{42 + 18}{7} = - \frac{24}{7}$