Perform the addition or subtraction: 15/8 - 7/8 = 12/15 + 7/15 = 45/100 + 35/100 = 65/76 - 25/76 = 43/56 - 33/56 = 6/23 + 20/23 = 4/7 + 2/7 = 3/4 + 3/4 = 7 - 4/9 = 8 7/6 - 6 = 4 + 1 3/5 = 7 - 2 1/2 =

Решение:

1. \( \frac{15}{8} - \frac{7}{8} = \frac{15-7}{8} = \frac{8}{8} = 1 \)
2. \( \frac{12}{15} + \frac{7}{15} = \frac{12+7}{15} = \frac{19}{15} = 1 \frac{4}{15} \)
3. \( \frac{45}{100} + \frac{35}{100} = \frac{45+35}{100} = \frac{80}{100} = \frac{4}{5} \)
4. \( \frac{65}{76} - \frac{25}{76} = \frac{65-25}{76} = \frac{40}{76} = \frac{10}{19} \)
5. \( \frac{43}{56} - \frac{33}{56} = \frac{43-33}{56} = \frac{10}{56} = \frac{5}{28} \)
6. \( \frac{6}{23} + \frac{20}{23} = \frac{6+20}{23} = \frac{26}{23} = 1 \frac{3}{23} \)
7. \( \frac{4}{7} + \frac{2}{7} = \frac{4+2}{7} = \frac{6}{7} \)
8. \( \frac{3}{4} + \frac{3}{4} = \frac{3+3}{4} = \frac{6}{4} = \frac{3}{2} = 1 \frac{1}{2} \)
9. \( 7 - \frac{4}{9} = 6 \frac{9}{9} - \frac{4}{9} = 6 \frac{5}{9} \)
10. \( 8 \frac{7}{6} - 6 = 1 \frac{7}{6} - 6 = 1 \frac{1}{6} \)
11. \( 4 + 1 \frac{3}{5} = 5 \frac{3}{5} \)
12. \( 7 - 2 \frac{1}{2} = 6 \frac{2}{2} - 2 \frac{1}{2} = 4 \frac{1}{2} \)