Question

5/7a +3/14a при a=4 2/3; 7/13

Answer 1

$(\frac{5}{7} + \frac{3}{14} )a = \frac{10 + 3}{14} a = \frac{13}{14} a = \frac{13}{14} \times \frac{14}{3} = \frac{13}{3} = 4 \frac{1}{3} \\ \frac{13}{14} \times \frac{7}{13} = \frac{1}{2}$