Question

1 pe 4 + 1 pe 5 dau 5 stele

Answer 1

1/4 + 1/5 = 5*1/4*5 + 4*1/4*5 = (5+4)/20 = 9/20

Answer 2

$\frac{1}{4}+ \frac{1}{5} = \frac{5}{20} + \frac{4}{20} = \frac{9}{20}$