Question

Решите пожалуйста:
1 3/4 * 4/5
2 1/4 : 3/4

Answer 1

$bold{1 dfrac{3}{4} cdot dfrac{4}{5}} = dfrac{7}{4} cdot dfrac{4}{5} = dfrac{7cdot4}{4cdot5} = dfrac{28^{:4}}{20^{:4}} = dfrac{7}{5} = bold{1 dfrac{2}{5}; }$


$bold{2 dfrac{1}{4} : dfrac{3}{4}} = dfrac{9}{4} : dfrac{3}{4} = dfrac{9}{4} cdot dfrac{4}{3} = dfrac{9 cdot 4}{4 cdot 3} = dfrac{36}{12} = bold{3}$