Найдите значения выражений.
а) 25/30 - 20/60 + 15/30.
б) 9/36 + 36/72 - 1/9.
в) 19/21 - 16/42 + 1/7.
г) 4/6 + 1/3 - 1/100.
Желательно поподробней.


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