Question

пожалуйста помогите 4 1/5 : 7/15 : 1/3 =
4 1/5 : (7/15 : 1/3)=
(2 1/4 +4 5/6) : 3 2/5 - 3/4 : 3/5=
(5 8/9 : 1 17/36 + 1 1/4) * 5/21

Answer 1

Ответ:

$4 \frac{1}{5} \div \frac{7}{15} \div \frac{1}{3} = \frac{21}{5} \times \frac{15}{7} \div \frac{1}{3} = \frac{9}{1} \div \frac{1}{3} = \frac{9}{1} \times \frac{3}{1} = 27$

$4 \frac{1}{5} \div (\frac{7}{15} \div \frac{1}{3}) = \frac{21}{5} \div ( \frac{7}{15} \times \frac{3}{1} ) = \frac{21}{5} \div \frac{21}{15} = \frac{21}{5} \times \frac{15}{21} = 3$

$(2 \frac{1}{4} + 4 \frac{5}{6} ) \div 3 \frac{2}{5} - \frac{3}{4} \div \frac{3}{5} = (6 \frac{3 + 10}{12} ) \div 3 \frac{2}{5} - \frac{3}{4} \times \frac{5}{3} = 7 \frac{1}{12} \div 3 \frac{2}{5} - \frac{5}{4} = \frac{85}{12} \div \frac{17}{5} - \frac{5}{4} = \frac{85}{12} \times \frac{5}{17} - \frac{5}{4} = \frac{25}{12} - \frac{5}{4} = \frac{25 - 15}{12} = \frac{10}{12} = \frac{5}{6}$

$(5 \frac{8}{9} \div 1 \frac{17}{36} + 1 \frac{1}{4}) \times \frac{5}{21} = (\frac{53}{9} \div \frac{53}{36} + 1 \frac{1}{4}) \times \frac{5}{21} = ( \frac{53}{9} \times \frac{36}{53} + 1 \frac{1}{4}) \times \frac{5}{21} = (4 + 1 \frac{1}{4} ) \times \frac{5}{21} = 5 \frac{1}{4} \times \frac{5}{21} = \frac{21}{4} \times \frac{5}{21} = \frac{5}{4} = 1 \frac{1}{4}$

Answer 2

Ответ:

Пошаговое объяснение:

1. 4 1/5 : (7/15 : 1/3) = 21/5 : (7/15 * 3/1) = 21/5 * 7/5 = 147/25 = 5 22/25

2. (2 1/4 +4 5/6) : 3 2/5 - 3/4 : 3/5 = 5/6

1. 2 1/4 +4 5/6 = 2 3/12 + 4 10/12 = 7 1/12

2. 7 1/12 : 3 2/5 = 85/12 * 5/17 = 25/12 = 2 1/12

3. 3/4 : 3/5 = 3/4 * 5/3 = 5/4 = 1 1/4

4. 2 1/12 - 1 1/4 = 2 1/12 - 1 3/12 = 10/12 = 5/6

3. (5 8/9 : 1 17/36 + 1 1/4) * 5/21 = 1 1/4

1. 5 8/9 : 1 17/36 = 53/9 * 36/53 = 4

2. 4 + 1 1/4 = 5 1/4

3. 5 1/4 * 5/21 = 21/4 * 5/21 = 5/4 = 1 1/4