Вопрос школьника по предмету Математика
Среднее арифметическое 3 чисел равно 3,2. Среднее арифметическое двух из них равно 2,85. Найдите 3 число
Ответ учителя по предмету Математика
(a+b+c) /3=3.2
(a+b) /2=2.85
a+b=5.7
(5.7+c) /3=3.2
5.7+c=9.6
c=3.9
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