Question

помогитее пожалуйста ​

Answer 1

$a = 1\frac{4}{20} = \frac{24}{20}$

$b = a - \frac{3}{20} = \frac{24}{20} - \frac{3}{20} = \frac{21}{20}$

$P = 2a + 2b = 2 * \frac{24}{20} + 2 * \frac{21}{20} = \frac{24}{10} + \frac{21}{10} = \frac{45}{10} = 4.5$

$P = 4.5$