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Пошаговое объяснение:

№1

1) 3/7 * 5/6 = 1/7 * 5/2 = 5/14

2) 5/14 : 3/7 = 5/14 * 7/3 = 5/2 * 1/3 = 5/6

3) 5/14 : 5/6 + 5/7 = 5/14 * 6/5 + 5/7 = 6/14 + 5/7 = 3/7 + 5/7 = 8/7 = 1 1/7

4) 8/13 * 4 1/3 = 8/13 * 13/3 = 8/3 = 2 2/3

5) 9 : 3/4 = 9 * 4/3 = 36/3 = 12

6) 9/16 : 36 = 9/16 * 1/36 = 1/16 * 1/4 = 1/64

7) 3 1/3 : 2 6/7 = 10/3 : 20/7 = 10/3 * 7/20 = 1/3 * 7/2 = 7/6 = 1 1/6

8) 5 5/8 * 1 5/36 = 45/8 * 41/36 = 15/8 * 41/12 = 615/96 = 6 39/96 = 6 13/32

№2

1)

5/7х = 1

х = 1 : 5/7

х = 1 * 7/5

х = 7/5

х = 1 2/5

2)

6/15х = 3/5

х = 3/5 : 6/15

х = 3/5 * 15/6

х = 1/1 * 3/2

х = 3/2

х = 1 1/2

3)

2 1/3х - 2 3/5 = 1 2/15

2 1/3х = 1 2/15 + 2 3/5

2 1/3х = 1 2/15 + 2 9/15

2 1/3х = 3 11/15

7/3х = 56/15

х = 56/15 : 7/3

х = 56/15 * 3/7

х = 8/5 * 1/1

х = 8/5

х = 1 3/5

4)

14(х - 1 1/2) = 3 1/2

х - 1 1/2 = 3 1/2 : 14

х - 1 1/2 = 7/2 * 1/14

х - 1 1/2 = 7/28

х = 7/28 + 1 1/2

х = 1/4 + 1 1/2

х = 1/4 + 1 2/4

х = 1 3/4