Решите 2 1/7 : 4 1/6 * 2 1/3; (7 1/3 + 2 1/4) : 1/4 - 30 5/6

[latex]2 frac{1}{7} :4 frac{1}{6} *2 frac{1}{3} = frac{15}{7} : frac{25}{6} * frac{7}{3} = frac{15*6*7}{7*25*3}= frac{6}{5}=1 frac{1}{5} [/latex][latex](7 frac{1}{3} +2 frac{1}{4} ): frac{1}{4} -30 frac{5}{6} =( frac{22}{3} + frac{9}{4}): frac{1}{4} - frac{185}{6} =( frac{22*4+9*3}{12}): frac{1}{4}- frac{185}{6} = \ =frac{115*4}{12*1} - frac{185}{6}= frac{115}{3} - frac{185}{6} = frac{115*2-185}{6} = frac{45}{6}= frac{15}{2} =7 frac{1}{2} [/latex]