Question

Помогите со 2 пожалуйста

Answer 1

$2-3\frac{1}{7} *(2-1\frac{9}{11} ):\frac{8}{21} =2-\frac{22}{7} *(\frac{22}{11} -\frac{20}{11} ):\frac{8}{21} =2-\frac{22}{7} *\frac{2}{11} *\frac{21}{8} =2-\frac{4}{7} *\frac{21}{8} =\\\\=2-\frac{3}{2} =\frac{4}{2} -\frac{3}{2} =\frac{1}{2}$