Question

распишите действия пожалуста

Answer 1

2/10+13/990=(198+13)/990=211/990
4/10+21/990=(396+21)/990=417/990
417*$\frac{211}{990} : \frac{417}{990} =417* \frac{211}{990} \frac{990}{417} =211$

Answer 2

$1) \frac{2}{10}+ \frac{13}{990}= \frac{198}{990}+ \frac{13}{990}= \frac{221}{990} \\ \\ 2) \frac{4}{10}+ \frac{21}{990}= \frac{396}{990}+ \frac{21}{990}= \frac{417}{990} \\ \\ 3)417\cdot \frac{221}{990}: \frac{417}{990}= 417\cdot \frac{221}{990}\cdot \frac{990}{417}=221$