Выполни действия в задании 6: a) 8 5/3 + 6 1/2 - 3 5/36

a) $8\frac{5}{3} + 6\frac{1}{2} - 3\frac{5}{36} = 8 + 6 - 3 + \frac{5}{3} + \frac{1}{2} - \frac{5}{36} = 11 + \frac{60 + 18 - 5}{36} = 11 + \frac{73}{36} = 11 + 2\frac{1}{36} = 13\frac{1}{36}$ б) $12\frac{3}{8} - 5\frac{1}{4} + 7\frac{1}{2} = 12 - 5 + 7 + \frac{3}{8} - \frac{1}{4} + \frac{1}{2} = 14 + \frac{3 - 2 + 4}{8} = 14 + \frac{5}{8} = 14\frac{5}{8}$ в) $2\frac{5}{6} - 1\frac{5}{19} + 1\frac{1}{7} = 2 - 1 + 1 + \frac{5}{6} - \frac{5}{19} + \frac{1}{7} = 2 + \frac{5 \cdot 19 \cdot 7 - 5 \cdot 6 \cdot 7 + 1 \cdot 6 \cdot 19}{6 \cdot 19 \cdot 7} = 2 + \frac{665 - 210 + 114}{798} = 2 + \frac{569}{798}$ г) $1\frac{1}{6} : 2\frac{1}{21} : 26 = \frac{7}{6} : \frac{43}{21} : 26 = \frac{7}{6} \cdot \frac{21}{43} : 26 = \frac{7 \cdot 7}{2 \cdot 43} : 26 = \frac{49}{86} : 26 = \frac{49}{86} \cdot \frac{1}{26} = \frac{49}{2236}$