15 : (3/12/17 + 2/5/17) + (4/1/5 - 2/3/5) : 4 Решите.

Решите задачу:

$15 \div ( 3\frac{12}{17} + 2 \frac{5}{17} ) + (4 \frac{1}{5} - 2 \frac{3}{5} )\div 4 = 15 \div 5 \frac{17}{17} + 1\frac{3}{5} \div 4 = \frac{15}{1} \div \frac{6}{1} + \frac{8}{5} \div \frac{4}{1} = \frac{15}{1} \times \frac{1}{6} + \frac{8}{5} \times \frac{1}{4} = \frac{5}{2} + \frac{2}{5} = \frac{25 + 4}{10} = \frac{29}{10} = 2 \frac{9}{10}$