Question

Помогите пожалуйста!!!!! Номер: 1213,1214

Answer 1

1213.
1)
$2.5 \times 3 \times ( - 8) = - 60$
2)
$- 25 \times 17 \times ( - 0.4) = 170$
3)
$3 \frac{4}{7} \times ( - 18) \times \frac{7}{25} = - ( \frac{25}{7} \times \frac{18}{1} \times \frac{7}{25} = \\ = - 18$
4)
$( - 2 \frac{5}{9} ) \times 27 \times \frac{9}{23} = - ( \frac{23}{9} \times \frac{27}{1} \times \frac{9}{23}) = - 27$
5)
$0.125 \times 3 \frac{14}{15} \times ( - 8) = \\ - ( \frac{125}{1000} \times \frac{59}{15} \times \frac{8}{1} ) = - \frac{59}{15} = \\ = 3 \frac{14}{15}$
6)
$- 4 \frac{1}{11} \times ( - 5.5) \times 2 = \frac{45}{11} \times \frac{55}{10} \times \frac{2}{1} = \\ = 45$
1214.
1)
$- 122 \times 83 - 61 \times 46 - ( - 6) \times 122 = \\ = - 61(2 \times 83 + 46 + ( - 6) \times 2) = \\ = - 61(166 + 46 - 12) = - 61 \times 200 = - 12200$
2)
$- 136 \times 57 - 68 \times 36 - 50 \times 68 = \\ = - 68(2 \times 57 + 36 + 50) = \\ = - 68(114 + 36 + 50) = \\ = - 68 \times 200 = - 13600$