5 21.9 7 15 24 4.8.20 : 5 10 2 6 3 28 7 9 30 40 20 3 50 5 4 17 10 5 20 34 2 15.150.2 20 200 200 3 14 18 2 63 28 6 77 77.11. 11 65 25 13 5137 7 81 2 18 90 3 20 42.7.3. - : 60 12 21 هر و १

Решение:

Задачи представлены в виде выражений с дробями и знаками умножения/деления. Для решения необходимо выполнить арифметические действия.

\( \frac{5}{7} \times \frac{21}{15} \div \frac{9}{24} = \frac{5}{7} \times \frac{21}{15} \times \frac{24}{9} = \frac{5 \times 21 \times 24}{7 \times 15 \times 9} = \frac{5 \times 3 \times 7 \times 3 \times 8}{7 \times 3 \times 5 \times 9} = \frac{8}{3} \)

\( \frac{4}{5} \times \frac{8}{10} \div \frac{20}{2} = \frac{4}{5} \times \frac{8}{10} \times \frac{2}{20} = \frac{4 \times 8 \times 2}{5 \times 10 \times 20} = \frac{64}{1000} = \frac{8}{125} \)

\( \frac{6}{7} \times \frac{3}{9} \div \frac{28}{30} = \frac{6}{7} \times \frac{3}{9} \times \frac{30}{28} = \frac{6 \times 3 \times 30}{7 \times 9 \times 28} = \frac{18 \times 30}{63 \times 28} = \frac{540}{1764} = \frac{15}{49} \)

\( \frac{40}{50} \times \frac{20}{5} \div \frac{3}{4} = \frac{40}{50} \times \frac{20}{5} \times \frac{4}{3} = \frac{4 \times 20 \times 4}{5 \times 3} = \frac{320}{15} = \frac{64}{3} \)

\( \frac{17}{20} \times \frac{10}{34} \div \frac{5}{2} = \frac{17}{20} \times \frac{10}{34} \times \frac{2}{5} = \frac{17 \times 10 \times 2}{20 \times 34 \times 5} = \frac{340}{3400} = \frac{1}{10} \)

\( \frac{15}{20} \times \frac{150}{200} \div \frac{2}{3} = \frac{15}{20} \times \frac{150}{200} \times \frac{3}{2} = \frac{3}{4} \times \frac{3}{4} \times \frac{3}{2} = \frac{27}{32} \)

\( \frac{14}{63} \times \frac{18}{28} \div \frac{2}{6} = \frac{14}{63} \times \frac{18}{28} \times \frac{6}{2} = \frac{2}{9} \times \frac{1}{2} \times 3 = \frac{3}{9} = \frac{1}{3} \)

\( \frac{77}{25} \times \frac{11}{13} \div \frac{65}{7} = \frac{77}{25} \times \frac{11}{13} \times \frac{7}{65} = \frac{77 \times 11 \times 7}{25 \times 13 \times 65} = \frac{5929}{21125} \)

\( \frac{81}{90} \times \frac{2}{3} \div \frac{18}{20} = \frac{81}{90} \times \frac{2}{3} \times \frac{20}{18} = \frac{9}{10} \times \frac{2}{3} \times \frac{10}{9} = \frac{180}{270} = \frac{2}{3} \)

\( \frac{42}{60} \times \frac{7}{12} \div \frac{3}{21} = \frac{42}{60} \times \frac{7}{12} \times \frac{21}{3} = \frac{7}{10} \times \frac{7}{12} \times 7 = \frac{343}{120} \)

Ответ:
\( \frac{8}{3} \)
\( \frac{8}{125} \)
\( \frac{15}{49} \)
\( \frac{64}{3} \)
\( \frac{1}{10} \)
\( \frac{27}{32} \)
\( \frac{1}{3} \)
\( \frac{5929}{21125} \)
\( \frac{2}{3} \)
\( \frac{343}{120} \)