Question

5/48-1/12
5/12-5/18
1/14-1/21
3/26-4/39

Answer 1

5/48-1/12=5/48-4/48=1/48
5/12-5/18=15/36-10/36=5/36
1/14-1/21=3/42-2/42=1/42
3/26-4/39=9/78-8/78=1/78

Answer 2

$1) \: \frac{5}{48} - \frac{1}{12} = \frac{5}{48} - \frac{1 \times 4}{12 \times 4} = \frac{5}{48} - \frac{4}{48} = \frac{1}{48}$

$2) \: \frac{5}{12} - \frac{5}{18} = \frac{5 \times 3}{12 \times 3} - \frac{5 \times 2}{18 \times 2} = \frac{15}{36} - \frac{10}{36} = \frac{5}{36}$

$3) \: \frac{1}{14} - \frac{1}{21} = \frac{1 \times 3}{14 \times 3} - \frac{1 \times 2}{21 \times 2} = \frac{3}{42} - \frac{2}{42} = \frac{1}{42}$

$4) \: \frac{3}{26} - \frac{4}{39} = \frac{3 \times 3}{26 \times 3} - \frac{4 \times 2}{39 \times 2} = \frac{9}{78} - \frac{8}{78} = \frac{1}{78}$

Вот я помогла