Question

помогите пожалуйста ​

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

Ответ:

а) 26

б) 0

в) 36/13

г)

$\frac{11251}{75}$

Пошаговое объяснение:

а)

$5 \frac{3}{4} \times 3 \frac{5}{7} + 3 \frac{5}{7} \times 1 \frac{1}{4} = \\ = 3 \frac{5}{7} (5 \frac{3}{4} + 1 \frac{1}{4} ) = \\ = \frac{26}{7} ( \frac{23}{4} + \frac{5}{4} ) = \\ = \frac{26}{7} ( \frac{23 + 5}{4} ) = \\ = \frac{26}{7} \times \frac{28}{4} = \\ = \frac{26}{7 \times 7} = 26$

б)

$15 \frac{3}{8} \times 4 \frac{1}{6} - 4 \frac{1}{6} \times 15 \frac{3}{8} = 0$

в)

$((3 \frac{1}{3} + 5 \frac{7}{9} ) \times 2 \frac{1}{4} - \\ - 1 \frac{1}{15} (3 \frac{5}{6} - \frac{7}{12} + 9 \frac{7}{8} )) \times \frac{16}{39} = \\ = (( \frac{10}{3} + \frac{53}{9} ) \times \frac{9}{4} - \frac{16}{15} ( \frac{23}{6} - \frac{7}{12} + \frac{79}{8} )) \times \frac{16}{39} = (( \frac{10 \times 3}{3 \times 3} + \frac{53}{9} - \frac{16}{15} \times ( \frac{4 \times 23}{4 \times 6} - \frac{2 \times 7}{2 \times 12} + \frac{3 \times 79}{3 \times 8} )) \times \frac{16}{39} = \\ = (( \frac{30}{9} + \frac{53}{9} ) \times \frac{9}{4} - \frac{16}{15} ( \frac{92}{24} - \frac{14}{24} + \frac{237}{24} )) \times \frac{16}{39} = \\ = (( \frac{30 + 53}{9} ) \times \frac{9}{4} - \frac{16}{15} ( \frac{92 - 14 + 237}{24} )) \times \frac{16}{39} = \\ = ( \frac{83}{9} \times \frac{9}{4} - \frac{16}{15} \times \frac{315}{24} ) \times \frac{16}{39} = \\ = ( \frac{83}{4} - \frac{16 \times 21}{24} ) \times \frac{16}{39} = \\ = ( \frac{6 \times 83}{6 \times 4} - \frac{336}{24} ) \times \frac{16}{39} = \\ = \frac{498}{336} 24 \times \frac{16}{39} = \\ = \frac{162}{24} \times \frac{16}{39} = \\ = \frac{2592}{936} = \frac{36}{13}$

г)

$(20 \frac{8}{15} \times 7 \frac{1}{2} - 54 \frac{3}{5} \times \frac{2}{5} ) \div \\ \div (3 \frac{13}{21} \times 8 \frac{2}{8} - 29 \frac{2}{5} ) - \frac{5}{6} \times 1 \frac{1}{5} + \frac{21}{25} = \\ = ( \frac{308}{15} \times \frac{15}{2} - \frac{273}{5} \times \frac{2}{5} ) \div ( \frac{76}{21} \times \frac{66}{8} - \frac{145}{5} ) - \frac{5}{6} \times \frac{6}{5} + \frac{21}{25} = \\ = ( \frac{152}{1} - \frac{546}{25} ) \div ( \frac{209}{7} - \frac{145}{5} ) - 1 + \frac{21}{25} = \\ = ( \frac{152 \times 25 - 546}{1 \times 25} ) \div ( \frac{209 \times 5}{7 \times 5} - \frac{145 \times 7}{7 \times 5} ) - \frac{1 \times 25 + 21 \times 1}{25} = \\ = \frac{3800 - 546}{25} \div \frac{1045 - 1015}{35} - \frac{25 + 21}{25} = \\ = \frac{3254}{25} \div \frac{30}{35} - \frac{46}{25} = \\ = \frac{3254}{25} \times \frac{35}{30} - \frac{46}{25} = \\ = \frac{3254}{25} \times \frac{35}{10} - \frac{46 \times 30}{25 \times 30} = \\ = \frac{113890 - 1380}{750} = \\ = \frac{112510}{750} = \frac{11251}{75}$