Помогите решить примеры пожалуйста

А)
$5 \frac{1}{7} \div 1 \frac{11}{21} = \frac{36}{7} \div \frac{32}{21} = \frac{36}{7} \times \frac{21}{32} = \frac{9 \times 3}{1 \times 8} = \frac{27}{8} = 3 \frac{3}{8}$
б)
$1 \frac{2}{15} \div 3.4 = \frac{17}{15} \div \frac{34}{10} = \frac{17}{15} \times \frac{10}{34 } = \frac{1 \times 2}{3 \times 2} = \frac{1}{3}$

в)
$6 \frac{6}{11} \div (1 \div 3 \frac{2}{3} ) - 4 \frac{2}{3} = \frac{72}{11} \div (1 \div \frac{11}{3} ) - \frac{14}{3} = \frac{72}{11} \div (1 \times \frac{3}{11} ) - \frac{14}{3} = \frac{72}{11} \div \frac{3}{11} - \frac{14}{3} = \frac{72}{11} \times \frac{11}{3} - \frac{14}{3} = \frac{72}{3} - \frac{14}{3} = \frac{58}{3} = 19 \frac{1}{3}$