Найдите среднее арифметическое чисел:( номер 460 )
1)5/6 и 7/20
2)1 3/7 и 2 5/21
3)2 3/5,3 3/10 и 2 1/2
4)7 5/24,6 7/24 и 8 1/6

ЕСЛИ МОЖНО, ТО С ОБЪЯСНЕНИЯМ
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