Помогите дам 15 баллов

Решите задачу:

$1)8 \frac{1}{4} - 5 \frac{1}{6} = \frac{33}{4} - \frac{31}{6} = \frac{198 - 124}{24} = \frac{74}{24} = 3 \frac{4}{24} = 3 \frac{1}{12} \\ 2)7 \frac{3}{5} - 3 \frac{5}{7} = \frac{38}{5} - \frac{26}{7} = \frac{266 - 130}{35} = \frac{136}{35} = 3 \frac{31}{35} \\ 3)1 \frac{3}{20} - \frac{1}{4} = \frac{23}{20} - \frac{1}{4} = \frac{23 - 5}{20} = \frac{18}{20} = \frac{9}{10} = 0.9 \\ 4)8 \frac{1}{6} - 7 \frac{7}{9} = \frac{48}{6} - \frac{70}{9} = \frac{432 - 420}{54} = \frac{12}{54} = \frac{6}{27} \\ 5)3 \frac{1}{6} + 3 \frac{5}{6} = \frac{19}{6} + \frac{23}{6} = \frac{42}{6} = 7 \\ 6)1 \frac{5}{8} + 6 \frac{5}{12} = \frac{13}{8} + \frac{77}{12} = \frac{39 + 154}{24} = \frac{193}{24} = 8 \frac{1}{24} \\ 7) \frac{47}{50} + 2 \frac{3}{20} = \frac{47}{50} + \frac{43}{20} = \frac{94 + 215}{100} = \frac{309}{100} = 3.09$