Question

( 5 3/7 - 2 2/3) * 21

Answer 1

=(38/7-7/3)*21=38*3-7*7=114-49=65

Answer 2

( 5 *3/7 - 2 *2/3) * 21

Сначала переводим в неправильную дробь.

(38/7 - 8/3)*21

Теперь приводим к общему знаменателю:

(114/21 - 56/21)*21

Считаем скобки

58/21*21

Сокращаем знаменатель и числитель:

Полученный ответ:

58.

Answer 3

To calculate the expression (5 3/7 - 2 2/3) * 21, we first need to convert the mixed numbers into improper fractions.

Converting 5 3/7 to an improper fraction: 5 3/7 = (5 * 7 + 3)/7 = 38/7

Converting 2 2/3 to an improper fraction: 2 2/3 = (2 * 3 + 2)/3 = 8/3

Now we can substitute the values back into the expression and calculate:

(38/7 - 8/3) * 21

To subtract the fractions, we need to find a common denominator, which in this case is 21:

(38/7 * 3/3 - 8/3) * 21 = (114/21 - 8/3) * 21

Now, let's subtract the fractions:

= (114/21 - 56/21) * 21 = 58/21 * 21

Multiplying the fractions:

= 58 * 1 = 58

Therefore, (5 3/7 - 2 2/3) * 21 equals 58.