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25 баллов

7 3/5 : (3 1/2 + 2 5/6) = 1 1/5,

1) 3 1/2 + 2 5/6 = (3 + 2) + (1/2 + 5/6) = 5 + (3/6 + 5/6) = 5 + 8/6 = 5 + 1 1/3 = 6 1/3,

2) 7 3/5 : 6 1/3 = 38/5 : 19/3 = 38/5 * 3/19 = 6/5 = 1 1/5