Помогите решить, очень срочно!!!!

Ответ:

Пошаговое объяснение:

а) $\frac{2}{3}*1\frac{2}{7}=\frac{2}{3}*\frac{9}{7} =\frac{2}{1}*\frac{3}{7} =\frac{6}{7}$

б) $3\frac{1}{8}*2 = \frac{25}{8}*\frac{2}{1}=\frac{25}{4}=6\frac{1}{4}$

в) $1\frac{1}{7}*1\frac{3}{4}=\frac{8}{7}*\frac{7}{4}=\frac{2}{1}*\frac{1}{1}=2$

г) $\frac{5}{6}:2\frac{2}{9}=\frac{5}{6}:\frac{20}{9}=\frac{5}{6}*\frac{9}{20}=\frac{1}{2}*\frac{3}{4}=\frac{3}{8}$

д) $3\frac{3}{5}:9 = \frac{18}{5}*\frac{1}{9}=\frac{2}{5}$

е) $7\frac{3}{5}:1\frac{9}{10}=\frac{38}{5}:\frac{19}{10}=\frac{38}{5}*\frac{10}{19}=\frac{2}{1}*\frac{2}{1}=4$

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а) $2\frac{1}{2}*1\frac{1}{5}-2\frac{2}{15}:2 =1\frac{14}{15}$

$1) 2\frac{1}{2}*1\frac{1}{5}=\frac{5}{2}*\frac{6}{5}=\frac{1}{1}*\frac{3}{1}=3$

$2) 2\frac{2}{15}:2 = \frac{32}{15}*\frac{1}{2}=\frac{16}{15}$

$3) 3 - \frac{16}{15}= 3 - 1\frac{1}{15}=2\frac{15}{15}-1\frac{1}{15} =1\frac{14}{15}$

б) $4\frac{3}{7}*8\frac{4}{9}-4\frac{3}{7}*6\frac{4}{9}=4\frac{3}{7}*(8\frac{4}{9}-6\frac{4}{9})=4\frac{3}{7}*2=\frac{31}{7}*2=\frac{62}{7}=8\frac{6}{7}$