Question

Пажалуйста помогите​

Answer 1

$1) 3\frac{1}{2} :\frac{2}{3} \cdot\frac{1}{5} = \frac{7}{2}\cdot\frac{3}{2} \cdot\frac{1}{5} =\frac{7\cdot3}{2\cdot2\cdot5}=\frac{21}{20} =1\frac{1}{20}$

$3) 3\frac{1}{5} \cdot\frac{5}{8} :\frac{2}{7} =\frac{16}{5} \cdot\frac{5}{8} \cdot\frac{7}{2} =\frac{16\cdot5\cdot7}{5\cdot8\cdot2} =\frac{1\cdot1\cdot7}{1\cdot1\cdot1} =7$

$5) 4\frac{1}{8}\cdot\frac{6}{11}:2\frac{1}{4} =\frac{33}{8}\cdot\frac{6}{11}:\frac{9}{4} =\frac{33\cdot6\cdot4}{8\cdot11\cdot9} =\frac{3\cdot2\cdot1}{2\cdot1\cdot3} =1$