Question

Выполните действие
даю 25 баллоа​

Answer 1

Объяснение:

1).

$2 \frac{1}{2} \times ( \frac{2}{15} - 3 \frac{5}{6}) + \frac{1}{4} = 2 \frac{1}{2} \times ( \frac{4}{30} - 3 \frac{25}{30}) + \frac{1}{4} = 2 \frac{1}{2} \times ( - 3 \frac{7}{10}) + \frac{1}{4} = \frac{5}{2} \times ( - \frac{37}{10}) + \frac{1}{4} = - \frac{37}{4} + \frac{1}{4} = - \frac{36}{4} = -9$

2).

$- 1 \frac{1}{7} \times ( \frac{4}{5} + \frac{19}{20}) \times (6 \frac{5}{6} + 4 \frac{2}{3}) = - 1 \frac{1}{7} \times ( \frac{16}{20} + \frac{19}{20}) \times (6 \frac{5}{6} + 4 \frac{4}{6}) = - 1 \frac{1}{7} \times \frac{35}{20} \times 11\frac{1}{2} = - \frac{8}{7} \times \frac{7}{4} \times \frac{23}{2} = - 23$

3).

$(6 \frac{3}{8} - 2 \frac{3}{4} ) \times ( - 4) + \frac{7}{18} \times 9 = (6 \frac{3}{8} - 2 \frac{6}{8} ) \times ( - 4) + 3.5 = 3 \frac{5}{8} \times ( - 4) + 3.5 = \frac{29}{8} \times ( - \frac{4}{1} ) + 3.5 = - \frac{29}{2} + \frac{7}{2} = - 11$

4).

$9 \frac{1}{6} \div (4 \frac{1}{3} - 8) + 24 \times \frac{3}{8} = 9 \frac{1}{6} \div ( - 3 \frac{2}{3} ) + 9 = \frac{55}{6} \times ( - \frac{3}{11}) + 9 = - \frac{ 5}{2} + 9 = - 2.5 + 9 = 6.5$