Question

Выполните умножение дробей а) 3/4×2/9 б) 7/5×15/14 в) 5/21×28/45 г) 8/15×25/28

Answer 1

а) $\frac{3}{4}* \frac{2}{9}=\frac{3}{2*2}* \frac{2}{3*3}=\frac{1}{2*1}* \frac{1}{1*3}=\frac{1}{6}$

б) $\frac{7}{5}* \frac{15}{14}=\frac{7}{5}* \frac{5*3}{7*2}=\frac{1}{1}* \frac{1*3}{1*2}=\frac{3}{2}$

в) $\frac{5}{21}* \frac{28}{45}=\frac{5}{3*7}* \frac{7*4}{5*9}=\frac{1}{3*1}* \frac{1*4}{1*9}=\frac{4}{27}$

г) $\frac{8}{15}*\frac{25}{28}=\frac{2*4}{3*5}*\frac{5*5}{4*7}=\frac{2*1}{3*1}*\frac{1*5}{1*7}=\frac{2*5}{3*7}=\frac{10}{21}$