А) 3 целых 2/5: x = 6 целых 4/5 : 1 целых 1/3

[latex]3 \frac{2}{5} :x = 6 \frac{4}{5} : 1 \frac{1}{3} \\ \\ 6 \frac{4}{5} *x= \frac{17}{5} * \frac{4}{3} \\ \\ \frac{34}{5} *x= \frac{68}{15} \\ \\ x= \frac{68}{15} : \frac{34}{5} = \frac{68*5}{15*34} = \frac{2*1}{3*1} \\ \\ x= \frac{2}{3} \\ \\ 3\frac{2}{5} : \frac{2}{3} =6 \frac{4}{5} : 1 \frac{1}{3} \\ \\ \frac{17*3}{5*2} = \frac{34*3}{5*4} \\ \\ \frac{51}{10} = \frac{51}{10} \\ \\ 5 \frac{1}{10} = 5 \frac{1}{10} [/latex]