Question

Calculati 2supra9-1supra 6; 5supra 12-2supra9; 7supra20-2supra15 , 5-supra6-1supra 8

Answer 1

2/9 - 1/6= 4/18 - 3/18= 1/18
5/12 - 2/9= 15/36 - 8/36=7/36
7/20 - 2/15=21/60 - 8/60=13/60
5/6 - 1/8= 20/24 - 3/24=17/24

Answer 2

$\frac{2}{9} - \frac{1}{6} = \frac{12 - 9}{63} = \frac{3}{63 } = \frac{1}{21}$
$\frac{5}{12} - \frac{2}{9} = \frac{45 - 24}{108} = \frac{21}{108} = \frac{7}{36}$
$\frac{7}{20 } - \frac{2}{15} = \frac{21 - 8}{60} = \frac{13}{60}$
$\frac{5}{6} - \frac{1}{8} = \frac{20 - 3}{24} = \frac{17}{24}$