Question

По действиям! Буквы "а", "б"

Answer 1

Пошаговое объяснение:

а) 1)

$7 \frac{1}{2} \times ( - \frac{1}{5} ) = - \frac{15 \times 1}{2 \times 5} = - \frac{3}{2}$

2)

$- 1 \frac{2}{3} \times ( - \frac{9}{10} ) = \frac{5 \times 9}{3 \times 10} = \frac{3}{2}$

3)

$- \frac{3}{2} + \frac{3}{2} = 0$

4)

$0 - 17 \frac{29}{30} = - 17 \frac{29}{30}$

б) 1)

$- 2 \frac{13}{25} \div - 2 \frac{7}{10} = - \frac{63}{25} \div - \frac{27}{10} = \frac{63 \times 10}{25 \times 27} = \frac{7 \times 2}{5 \times 3} = \frac{14}{15}$

2)

$17 \frac{25}{47} \div - 17 \frac{25}{47} = - 1$

3)

$\frac{14}{15} - ( - 1) = \frac{14}{15} + 1 = 1 \frac{14}{15}$

4)

$1 \frac{14}{15} - 4 \frac{3}{5} = \frac{29}{15} - \frac{23}{5} = \frac{29}{15} - \frac{63}{15} = - \frac{34}{15} = 2 \frac{4}{15}$