Question

обчислити
(7/20)-(-3/5); -5 1/4×(-2 2/7)​

Answer 1

Ответ:

$1) \frac{19}{20}$

$2)12$

Пошаговое объяснение:

$\frac{7}{20} - ( - \frac{3}{5)} = \frac{7}{20} + \frac{3}{5} = \\ = \frac{7 \times 5 + 3 \times 20}{20 \times 5} = \\ = \frac{35 + 60}{100} = \frac{95}{100} = \frac{19}{20}$

Вiдповiдь:

$1) \frac{19}{20}$

$( - 5 \times \frac{1}{4}) \times ( - 2 \times \frac{2}{7} ) = \\ = - \frac{21}{4} \times ( - \frac{16}{7} ) = \\ = \frac{21}{4} \times \frac{16}{7} = 12$

Вiдповiдь:

$2)12$