Ответ:

Пошаговое объяснение:

1.

а) = 49/70 * 140/49 = 140/70 = 2

б) = 7/5 : 27/7 = 7/5 * 7/27 = 49/135

в) = 8 5/10 : 3 8/10 = 8 1/2 : 3 4/5 = 17/2 : 19/5 = 17/2 * 5/19 = 85/38 = 2 11/38

г) = 48 1/10 : 6 5/10 = 48 1/10 : 6 1/2 = 481/10 : 13/2 = 481/10 * 2/13 = 37/5 * 1/1 = 37/5 = 7 2/5.

2.

х = 32/4 : 5/8

х = 32/4 * 8/5

х = 8 * 8/5

х = 64/5

х = 12 4/5

3.

а)

1) 4,5 * 3,1 = 13,95

2) 13,95 : 0,5 = 27,9

3) 27,9 + 4,3 = 32,2

Это числитель

4) 8 * 6/7 = 48/7 = 6 6/7

5) 6 6/7 + 45 = 51 6/7

Это знаменатель

6) 32,2 / 51 6/7 = 32 2/10 : 51 6/7 = 32 1/5 : 51 6/7 = 161/5 : 363/7 = 161/5 * 7/363 = 1127/1815

б)

1) (4/7)² = 16/49

2) (3/7)² = 9/49

3) 16/49 + 9/49 + 49/7 =

16/49 + 9/49 + 343/49 =

368/49

4) 368/49 : 2 5/7 = 368/49 : 19/7 = 368/49 * 7/19 = 368/7 * 1/19 = 368/133 = 2 102/133

4.

1) 3 3/5 : 1/5 = 18/5 * 5/1 = 18/1 = 18

2) 1 5/12 * 6 = 17/12 * 6 = 17/2 = 8 1/2

3) 18 - 8 1/2 = 17 2/2 - 8 1/2 = 9 1/2