Ответ:

Пошаговое объяснение:

1)

(х-13)/4 = 9/7

х - 13 = 4 * 9 / 7

х - 13 = 36/7

х - 13 = 5. 1/7

х = 5. 1/7 + 13

х = 18. 1/7

2)

5/8 = (х-14)/3

8 * (х - 14) = 5 * 3

8х - 112 = 15

8х = 15 + 112

8х = 127

х = 127 : 8

х = 15,875

3)

2. 1/4 : х = 1. 5/6 : 1/22

9/4 : х = 11/6 : 1/22

11/6 * х = 1/22 * 9/4

11/6х = 9/88

х = 9/88 : 11/6

х = 9/88 * 6/11

х = 9/44 * 3/11

х = 27/484

4)

5 : 12 = (х - 9) : 4

12 * (х - 9) = 5 * 4

12х - 108 = 20

12х = 20 + 108

12х = 128

х = 128 : 12

х = 128/12

х = 10. 8/12

х = 10. 2/3

5)

1. 1/3 : 4. 2/5 = х : 1/4

4. 2/5 * х = 1. 1/3 * 1/4

22/5х = 4/3 * 1/4

22/5х = 1/3

х = 1/3 : 22/5

х = 1/3 * 5/22

х = 5/66