Question

3 + 5
— — (а
4 6
1 + 1 + 1
— — — (б
5 2 3
1+ 1 + 1
1 — — — (в
5 2 3
2 + 3
2 — 1 — (г
5 4​

Answer 1

$\frac{3}{4} + \frac{5}{6} = \frac{9 + 10}{12} = \frac{19}{12} = 1 \frac{7}{12}$

$\frac{1}{4} + \frac{1}{3} + \frac{1}{6} = \frac{3 + 4 + 2}{12} = \frac{9}{12} = \frac{3}{4}$

$1 \frac{1}{5} + \frac{1}{2} + \frac{1}{3} = \frac{6}{5} + \frac{1}{2} + \frac{1}{3} = \frac{6 \times 6 + 15 + 10}{30} = \frac{36 + 25}{30} = \frac{61}{30} = 2 \frac{1}{30}$

$2 \frac{2}{5} + 1 \frac{3}{4} = \frac{12}{5} + \frac{7}{4} = \frac{48 + 35}{20} = \frac{83}{20} = 4 \frac{3}{20}$