Реши примеры на сложение и вычитание смешанных дробей: а) 1 1/2 + 1 1/5

Решаю все примеры по очереди: а) $1 \frac{1}{2} + 1 \frac{1}{5} = \frac{3}{2} + \frac{6}{5} = \frac{15}{10} + \frac{12}{10} = \frac{27}{10} = 2 \frac{7}{10}$ б) $1 \frac{1}{21} + 2 \frac{2}{7} = \frac{22}{21} + \frac{16}{7} = \frac{22}{21} + \frac{48}{21} = \frac{70}{21} = \frac{10}{3} = 3 \frac{1}{3}$ в) $2 \frac{17}{9} + 5 \frac{3}{7} = \frac{35}{9} + \frac{38}{7} = \frac{245}{63} + \frac{342}{63} = \frac{587}{63} = 9 \frac{20}{63}$ г) $5 \frac{7}{9} - 0 = 5 \frac{7}{9}$ д) $5 \frac{7}{10} + 0 = 5 \frac{7}{10}$ е) $2 \frac{3}{5} - 2 \frac{2}{5} = \frac{13}{5} - \frac{12}{5} = \frac{1}{5}$ ж) $1 \frac{2}{13} - 3 \frac{4}{7} = \frac{15}{13} - \frac{25}{7} = \frac{105}{91} - \frac{325}{91} = -\frac{220}{91} = -2 \frac{38}{91}$ з) $3 \frac{5}{7} - 4 \frac{4}{21} = \frac{26}{7} - \frac{88}{21} = \frac{78}{21} - \frac{88}{21} = -\frac{10}{21}$ и) $4 \frac{7}{12} + 4 \frac{5}{21} = \frac{55}{12} + \frac{89}{21} = \frac{1925}{252} + \frac{1068}{252} = \frac{2993}{252} = 11 \frac{221}{252}$ к) $5 \frac{7}{21} - 0 = 5 \frac{7}{21}$ м) $4 \frac{4}{5} + 7 \frac{13}{12} = \frac{24}{5} + \frac{97}{12} = \frac{288}{60} + \frac{485}{60} = \frac{773}{60} = 12 \frac{53}{60}$