Question

помогите пожалуйста,очень срочно

Answer 1

Ответ:

$1) \: \: \frac{3}{4} \times \frac{6}{5} = \frac{18}{20} = \frac{9}{10} \\ 2) \: \: \: \frac{21}{5} \times \frac{3}{7} = \frac{9}{5} = 1 \frac{4}{5} \\ 3) \: \: \: \frac{3}{5 } \times \frac{25}{4} = \frac{15}{4} = 3 \frac{3}{4} \\ 4) \: \: \: \frac{9}{5} \times \frac{2}{3} = \frac{6}{5} = 1 \frac{1}{5}$

$5) \: \: \: \frac{5}{3} \times \frac{9}{2} = \frac{15}{2} = 7 \frac{1}{2} \\ 6) \: \: \: \frac{7}{5 } \times \frac{12}{35} = \frac{12}{25} \\ 7) \: \: \: \frac{12}{5} \div \frac{15}{2} = \frac{12 \times 2}{5 \times 15} = \frac{24}{75} = \frac{8}{25 } \\ 8) \: \: \: \frac{6}{5} \div \frac{4}{11} = \frac{6 \times 11}{5 \times 4} = \frac{66}{20} = \frac{33}{10} = 3 \frac{3}{10}$

Й

$9) \: \: \: \frac{3}{5} \div \frac{4}{35} = \frac{3 \times 35}{5 \times 4} = \frac{21}{4} = 5 \frac{1}{4} \\ 10) \: \: \: \frac{21}{2} \div \frac{3}{5} = \frac{21 \times 5}{2 \times 3} = \frac{35}{2} = 17 \frac{1}{2}$

$12) \: \: \: \: \frac{14}{5} \div \frac{7}{2} = \frac{14 \times 2}{5 \times 7} = \frac{4}{5} \\ 13) \: \: \: \: ( \frac{17}{10} - \frac{1}{10} ) \times \frac{2}{15} = ( \frac{17 - 1}{10} ) \times \frac{2}{15} = \frac{16}{10} \times \frac{2}{15} = \frac{16}{15} = 1 \frac{1}{15} \\ 14) \: \: \: ( \frac{5}{22} - \frac{8}{11} ) \div \frac{11}{5} = ( \frac{5 - 16}{22} ) \div \frac{11}{5} = - \frac{11}{22} \div \frac{11}{5} = - \frac{1}{2} \div \frac{11}{5} = - \frac{1 \times 5}{2 \times 11} = - \frac{5}{22}$

$15) \: \: \: \: ( \frac{5}{26} - \frac{3}{25} ) \times \frac{13}{2} = ( \frac{125 - 78}{650} ) \times \frac{13}{2} = \frac{47}{650} \times \frac{13}{2} = \frac{47}{100} \\ 16) \: \: \: \: ( \frac{10}{13} + \frac{15}{4} ) \times \frac{26}{5} = ( \frac{40 + 195}{52} ) \times \frac{26}{5} = \frac{135}{52} \times \frac{26}{5} = \frac{27}{2} = 13 \frac{1}{2}$

$17) \: \: \: \: ( \frac{17}{26} + \frac{11}{13} ) \times \frac{17}{6} = ( \frac{17 + 22}{26} ) \times \frac{17}{6} = \frac{39}{26} \times \frac{17}{6} = \frac{221}{52} = 4 \frac{13}{52} = 4 \frac{1}{4} \\ 18) \: \: \: \: ( \frac{11}{12} + \frac{11}{20} ) \times \frac{15}{8} = ( \frac{55 + 33}{60} ) \times \frac{15}{8} = \frac{22}{60} \times \frac{15}{8} = \frac{11}{30} \times \frac{15}{8} = \frac{11}{16}$

$19) \: \: \: \: ( \frac{3}{4} - \frac{1}{6} ) \times 3 = (\frac{9 - 2}{12} ) \times 3 = \frac{7}{12} \times \frac{3}{1} = \frac{7}{4} = 1 \frac{3}{4} \\ 20) \: \: \: \: ( \frac{2}{5} + \frac{13}{15} ) \times 6 = ( \frac{6 + 13}{15} ) \times 6 = \frac{19}{15} \times \frac{6}{1} = \frac{38}{5} = 7 \frac{3}{5}$

$21) \: \: \: \: ( \frac{3}{8} - \frac{1}{20} ) \times 10 = ( \frac{15 - 2}{40} ) \times 10 = \frac{13}{40} \times \frac{10}{1} = \frac{13}{4} = 3 \frac{1}{4}$

$22) \: \: \: ( \frac{2}{20} + \frac{7}{30} ) \times 15 = ( \frac{6 + 14}{60} ) \times 15 = \frac{20}{60} \times \frac{15}{1} = \frac{1}{3} \times \frac{15}{1} = \frac{5}{1} = 5 \\ 23) \: \: \: \: ( \frac{9}{10} - \frac{7}{15} ) \times 3 = ( \frac{27 - 14}{30} ) \times 3 = \frac{13}{30} \times \frac{3}{1} = \frac{13}{10} = 1 \frac{3}{10}$

$24) \: \: \: \: ( \frac{1}{6} + \frac{1}{4} ) \times 9 = ( \frac{2 + 3}{12} ) \times 9 = \frac{5}{12} \times \frac{9}{1} = \frac{15}{4} = 3 \frac{3}{4}$