Question

3 целых1/3:1 целую19/21·2 целых3/14

Answer 1

Выражением:
$3 frac{1}{3} : 1 frac{19}{21} * 2 frac{3}{14} = frac{3*3+1}{3} : frac{1*21+19}{21} * frac{2*14+3}{14} = \ \ = frac{10}{3} : frac{40}{21} * frac{31}{14} = frac{10*21*31}{3*40*14} = frac{1*3*31}{3*4*2} = frac{1*1*31}{1*4*2} = \ \ = frac{31}{8} = 3 frac{7}{8}$

По действиям:
$3 frac{1}{3} : 1 frac{19}{21} * 2 frac{3}{14} =3 frac{7}{8} \ \ 1) 3 frac{1}{3} : 1 frac{19}{21}= frac{3*3+1}{3} : frac{1*21+19}{21} = frac{10}{3} * frac{21}{40} = frac{1*7}{1*4} = 1 frac{3}{4} \ \ 2) 1 frac{3}{4} * 2 frac{3}{14} = frac{7}{4} * frac{31}{14} = frac{1*31}{4*2} = frac{31}{8} = 3 frac{7}{8}$