3 целых -8/20 = ? 4 целых - 2 целых 2/11 = ? 5 целых 2/5 - 4/5 = ? 9 целых 16/25 - 6/25 =...

$1) 3 - \frac{8}{20} = \frac{3}{1} - \frac{8}{20} = \frac{60}{20} - \frac{8}{20} = \frac{52}{20}$

2) $4 - 2\frac{2}{11} = \frac{4}{1} - \frac{23}{11} = \frac{44}{11} - \frac{23}{11} = \frac{21}{11}$

3) $5 \frac{2}{5} - \frac{4}{5} = \frac{27}{5} - \frac{4}{5} = \frac{23}{5}$

4) $9 \frac{16}{25} - \frac{6}{25} = \frac{241}{25} - \frac{6}{25} = \frac{235}{25}$

5) 1\3 - 1\4 = 4\12 - 3\12 = 1\12

6) 2\3 - 1\7 = 14\21 - 3\21 = 11\21

7) 3\5 + 3\10 = 6\10 + 3\10 = 9\10