Question

Efectuiaza a) 1 supra 2 - 1 supra 3 b) 2 supra 3 - 1 supra 6 c) 4 supra 5-1 supra 10 d) 5 supra 12 - 5 supra 18 e) 2- 4 supra 4 f) 3- 6 supra 5

Answer 1

$\frac{1}{2} - \frac{1}{3} = \frac{(3 - 2)}{6} = \frac{1}{6}$
$\frac{2}{3} - \frac{1}{6} = \frac{(2 \times 2 - 1)}{6} = \frac{3}{6} = \frac{1}{2}$
$\frac{4}{5} - \frac{1}{10} = \frac{(2 \times 4 - 1)}{10} = \frac{7}{10}$
$\frac{5}{12} - \frac{5}{18} = \frac{(18 \times 5 - 12 \times 5)}{216} = \\ \frac{90 - 60}{216} = \frac{30}{216} = \frac{5}{36}$
$2 - \frac{4}{4} = 2 - 1 = 1$
$3 - \frac{6}{5} = \frac{(5 \times 3 - 6)}{5} = \frac{9}{5}$