Вопрос школьника по предмету Алгебра
Знайдіть номер члена арифметичної прогресії (Zn), який дорівнює 3,2, якщо z1=9,2 і d=-0,6.
Ответ учителя по предмету Алгебра
Ответ: n=11.
Объяснение:
z₁=9,2 d=-0,6 an=3,2 n=?
an=9,2+(n-1)*(-0,6)=3,2
9,2-0,6n+0,6=3,2
9,8-0,6n=3,2
-0,6n=-6,6 |÷(-0,6)
n=11.
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