Вопрос школьника по предмету Математика
Сколько членов в арифметической прогрессии,если первый член равен 6,а разность прогрессии 5,последний член 66
Ответ учителя по предмету Математика
а1=6
д=5
ап=а1+д(п-1)
66=6+5(п-1)
66=6+5п-5
5п=66-6+5
5п=65
п=13
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