Ср. арифм. = 15
a + b + c = 15 * 3 = 45
b + c = (a + b + c) - a = 45 - 6 = 39
b + c = 39
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Ср. арифм. = 15
a + b + c = 15 * 3 = 45
b + c = (a + b + c) - a = 45 - 6 = 39
b + c = 39