Помогите,пожалуйста!

1)
▪а)

$4 \frac{5}{13} + 8 \frac{7}{13} + 11 \frac{8}{13} + 14 \frac{8}{15} = 23 \frac{5 + 7 + 8}{13} + 14 \frac{8}{15} = 23 \frac{20}{13} + 14 \frac{8}{15} = 24 \frac{7}{13} + 14 \frac{8}{15} = 38 \frac{7 \times 15 + 8 \times 13}{195} = 38 \frac{105 + 104}{195} = 38 \frac{209}{195} = 39 \frac{14}{195}$
▪б)

$- 4.83 + 3.99 + 2.83 = ( - 4.83 + 2.83) + 3.99 = - 2 + 3.99 = 1.99$
▪в)

$( - \frac{5}{14} ) \times ( \frac{37}{11} ) \times ( - \frac{11}{37} ) \times (- 28) = - \frac{5 \times ( - 28)}{14} \times \frac{37 \times ( - 11)}{11 \times 37} = 5 \times 2 \times ( - 1) = - 10$

2)
▪а)
$(7 + \frac{5}{12} ) \times 12 = 7 \times 12 + \frac{5 \times 12}{12} = 84 + 5 = 89$

▪б)
$9 \times 7 \frac{4}{9} = 9 \times 7 + \frac{9 \times 4}{9} = 63 + 4 = 67$