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5,8,11,14,17 Арифметик прогрессын 30 дугаар гишүүний олоорой.
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2,9,16,23,30... Дарааллын зүй тогтлыг олоорой. (a)
Арифметик прогрессын n дүгээр гишүүнийг олох томьёог олоорой.
an=a1+(n−1)×da_n=a_1+\left(n-1\right)\times dan=a1+(n−1)×d
a1=an+(n−1)×da_1=a_n+\left(n-1\right)\times da1=an+(n−1)×d
an=an+(n+1)×da_n=a_n+\left(n+1\right)\times dan=an+(n+1)×d
an=a1+(n+1)×da_n=a_1+\left(n+1\right)\times dan=a1+(n+1)×d
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