(1 1/5+2 3/10)÷1/2+(6 3/4-2 2/3)÷1 1/6

Ответ:

здравствуйте!

$(1 \frac{1}{5} + 2 \frac{3}{10}) \div \frac{1}{2} + (6 \frac{3}{4} - 2 \frac{2}{3}) \div 1 \frac{1}{6} = \\ = ( \frac{6}{5} + \frac{23}{10}) \times 2 + ( \frac{27}{4} - \frac{8}{3}) \times \frac{6}{7} = \\ = \frac{35}{10} \times 2 + \frac{49}{12} \times \frac{6}{7} = 7 + \frac{7}{2} = \\ = \frac{14 + 7}{2} = \frac{21}{2}$ = 10,5