Вычислите периметр треугольника ABC, если: а) AB = AC = BC = 9,7 см; б) AB = 2AC = 16 см, BC = 10,6 см; в) AB = 0,8(AC + BC) = 12 см; г) AB + AC = 15 см, AB + BC = 16 см, AC + BC = 17 см.
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