Предмет: Алгебра, автор: Jordan787

среднее арифметические трех чисел равно 68.первые два числа равны 58 и 91.найти третье

Ответы

Автор ответа: Emici

Если среднеарифметическое 3-х чисел равно 68, то их сумма равна 68*3=204
А третье число равно: 204-58-91=55

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