Question

Можно оба примера по действиям ​

Answer 1

а)

$\frac{7}{2000} + \frac{65}{10000} = \frac{7}{2000} + \frac{13}{2000} = \frac{20}{2000} = \frac{1}{100}$

$- \frac{1}{100} \div \frac{1}{1000} = - \frac{1}{100} \times 1000 = - 10$

$\frac{3}{3125} + \frac{4}{100000} = \frac{3}{3125} + \frac{1}{25000} = \frac{3 \times 8}{3125 \times 8} + \frac{1}{25000} = \frac{25}{25000} = \frac{1}{100}$

$- \frac{1}{100} \times \frac{1}{ \frac{1}{1000} } = - \frac{1}{100} \times 1000 = - 10$

$- 10 \div - 10 = 1$

б)

$1 \div \frac{1}{40} = 1 \times 40 = 40$

$1 \div \frac{5}{100} = 1 \div \frac{1}{20} = 1 \times 20 = 20$

$- 1 \div \frac{4}{100} = - 1 \div \frac{1}{25} = - 1 \times 25 = - 25$

$- 40 \div 20 = - 2$

$- 2 \div 25 = - \frac{2}{25} = - \frac{8}{100} = - 0.08$