Question

помогите пожалуйств​

Answer 1

20 1/19 - (х - 17/19) = 7 18/19

х - 17/19 = 20 1/19 - 7 18/19

х - 17/19 = 19 20/19 - 7 18/19

х - 17/19 = 12 2/19

х = 12 2/19 + 17/19

х = 12 19/19

х = 13

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Проверка:

20 1/19 - (13 - 17/19) = 7 18/19

20 1/19 - 12 2/19 = 7 18/19

19 20/19 - 12 2/19 = 7 18/19

7 18/19 = 7 18/19