Question

помогите дам 100 баллов!!!!​

Answer 1

Ответ:

Пошаговое объяснение:

1.

2 5/7 * 14 = 19/7 * 14 = 19/1 * 2 = 38/1 = 38

2.

( 1 3/4 + 2/7 ) * 28 = 57

1)  1 3/4 + 2/7 = 7/4 + 2/7 = 49/28 + 8/28  = 57/28 = 2 1/28

2) 2 1/28 * 28 = 57/28 * 28 = 57/1 * 1 = 57

Если єто степень

( $1^{3/4}$ + 2/7 ) * 28

1) $1^{3/4}$ = 1 + 2/7 = 1/1 + 2/7 = 7/7 + 2/7 = 9/7 = 1 2/7

2) 1 2/7 * 28 = 9/7 * 28 = 9/1 * 4 = 36/1 = 36

3.

12 2/3 * 7 11/15 + 1/3 * 7 1/15 = (  12 2/3 + 1/3 ) * 7 11/15 = ( 38/3  + 1/3 ) * 116/15 =

39/3 * 116/15 = 13 * 116/15 = 13/1 * 116/15 = 1508/15 = 100 8/15

Answer 2

Пошаговое объяснение:

2 5/7 * 14 = 19/7 * 14 = 19/1 * 2 = 38/1 = 38

(1 3/4 + 2/7) * 28 = (1 21/28 + 8/28) * 28 =

1 29/28 * 28 = 2 1/28 * 28 = 57/28 * 28 = 57/1 * 1 = 57/1 = 57

12 2/3 * 7 11/15 + 1/3 * 7 11/15 =

7 11/15 * (12 2/3 + 1/3) =

7 11/15 * 12 3/3 =

7 11/15 * 13 = 116/15 * 13 = 1508/15 = 100 8/15