Question

650. Вычислите: 5 1) -1,28 : (0,64 (3) ) 0 2) (3) (-4) : (1-3); ) 8 5 19 -25,6 6 2 -27 . 2 9 3) 4) 27 -16 - 7 72 4 -5 9 49 ​

Answer 1

Ответ:

1)

$- 1.28 \div (0.64 \times ( - \frac{1}{8} )) = - \frac{128}{100} \div ( \frac{64}{100} \times ( - \frac{1}{8} )) = - \frac{128}{100} \div ( - \frac{8}{100} ) = \frac{128}{100} \times \frac{100}{8} = 16$

2)

$(3 \frac{4}{5} \times ( - 4 \frac{5}{19} )) \div ( - 3) = ( \frac{19}{5} \times ( - \frac{81}{19} )) \div ( - 3) = - \frac{ 81}{5} \div ( - 3) = \frac{81}{15} = \frac{27}{5} = 5 \frac{2}{5} = 5.4$

3 и 4 пример во вложении