Ответ:

Пошаговое объяснение:

Ответ:

Пошаговое объяснение:

1.

1) 9/10 * 20/27 = 1/1 * 2/3 = 2/3

2) 5/16 : 10/24 = 5/16 * 24/10 = 1/2 * 3/2 = 3/4

3) 5/9 * 1 7/20 = 5/9 * 27/20 = 1/1 * 3/4 = 3/4

4) 2/3 + 3/4 - 3/4 = 2/3

2.

1) 69/70 * 7/23 = 3/10 * 1/1 = 3/10

2) 4/25 : 4/5 = 4/25 * 5/4 = 5/25 = 1/5

3) 3/5 * 25/36 = 1/1 * 5/12 = 5/12

4) 3/10 - 1/5 + 5/12 =

18/60 - 12/60 + 25/60 = 31/60

3.

1) 120/169 * 13/60 = 2/13 * 1/1 = 2/13

2) 200/243 : 100/81 =

200/243 * 81/100 =

2/3 * 1/1 = 2/3

3) 1/13 * 10 = 10/13

4) 2/13 + 2/3 - 10/13 =

6/39 + 26/39 - 30/39 = 32/39

4.

1) 125/147 * 21/50 = 5/7 * 1/2 = 5/14

2) 70/119 * 17/210 = 1/7 * 1/3 = 1/21

3) 3/14 * 7/9 = 1/2 * 1/3 = 1/6

4) 5/14 - 1/21 - 1/6 =

15/42 - 2/42 - 7/42 = 6/42 = 1/7