Question

Выполните действия: а) 2 1/10 : 1 2/5 б)4 1/2 : 5 1/4 в)4 3/4 : 1/4 - 2 3/14 * 7

Answer 1

$a)2\tt\displaystyle\frac{1}{10}:1\frac{2}{5}=\frac{21}{10}:\frac{7}{5}=\frac{21}{10}*\frac{5}{7}=\frac{3}{2}=1 \frac{1}{2}=1,5$

$b)4\tt\displaystyle\frac{1}{2}:5\frac{1}{4}=\frac{9}{2}:\frac{21}{4}=\frac{9}{2}*\frac{4}{21}=\frac{6}{7}$

$c)4\tt\displaystyle\frac{3}{4}:\frac{1}{4}-2\frac{3}{14}*7=\frac{19}{4}:\frac{1}{4}-\frac{31}{14}*7=\frac{19}{4}*4-\frac{31}{2}=19-15\frac{1}{2}=19-15,5=3,5$