Question

8 цілих 9/26 - z =5 цілих 7/39

Answer 1

$8 \frac{9}{26} - z = 5 \frac{7}{39} \\ \\ z = 8 \frac{9}{26} - 5 \frac{7}{39} \\ \\ z = \frac{217}{26} - \frac{202}{39} = \frac{651}{78} - \frac{404}{78} = \\ \\ \frac{651 - 404}{78} = \frac{247}{78} = \frac{19}{6} \\ \\ z = 3 \frac{1}{6}$