Question

(2 4/7-2.5):(1/6-1/21)

Answer 1

По действиям:

1.

$2 frac{4}{7} -2,5=2 frac{4}{7} -2 frac{5}{10}= 2 frac{4*10}{7*10} -2 frac{5*7}{10*7}= \ \ 2 frac{40}{70} -2 frac{35}{70}= frac{5}{70} = frac{1}{14}$

2.

$frac{1}{6} - frac{1}{21} = frac{1*21}{6*21} - frac{1*6}{21*6} =frac{21}{126} - frac{6}{126} = frac{15}{126} =frac{15:3}{126:3} = frac{5}{42}$

3.

$frac{1}{14}:frac{5}{42}=frac{1}{14}*frac{42}{5}=frac{1}{14:14}*frac{42:14}{5}= frac{1}{1} * frac{3}{5} = frac{3}{5} =0,6$