В) 26/27:*=13/54 г) * + 3/7=1 д) * : 3/7=14/15 е) * - 5/16=1/4

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в) 26/27:*=13/54

х = 26/27 : 13/54

х = 26/27 * 54/13 = 2/1 * 2/1 = 4

х = 4

26/27 : 4 = 13/54

26/27 : 4/1 = 13/54

26/27 * 1/4 = 13/54

13/27 * 1/2 = 13/54

13/54 = 13/54

г) * + 3/7=1

х = 1 - 3/7

х = 1/1 - 3/7 = 7/7 - 3/7

х = 4/7

4/7 - 3/7 = 1

1 = 1

д) * : 3/7=14/15

х = 14/15 * 3/7

х = 2/5 * 1/1

х = 2/5

2/5 : 3/7 = 14/15

2/5 * 7/3 = 14/15

14/15 = 14/15

е) * - 5/16=1/4

х = 1/4 + 5/16

х = 4/16 + 5/16

х = 9/16

9/16 - 5/16 = 1/4

4/16 = 1/4

1/4 = 1/4