Question

3) 2/5+1целая1/4а при а =1 целая 3/5

4) 2 целых 3/10b+1/2прмb=2целых 1/2

Answer 1

3) $\frac{2}{5} + \frac{5}{4}a = \frac{8}{20} + \frac{25}{20}a = \frac{33}{20}a$

$\frac{33}{20} * \frac{8}{5} = \frac{66}{25} = 2\frac{16}{25}$

4) $\frac{23}{10}b + \frac{1}{2} = \frac{23}{10}b + \frac{5}{10} = \frac{28}{10}b$

$\frac{28}{10} * \frac{5}{2} = \frac{14}{2} = 7$