Question

Последовательность задана формулой:an=n-1/3n найти: a1, a3,a5,a21

Answer 1

A1=1-1/3*1=0
a3=3-1/3*3=0,2
a5=5-1/5*3=0,27
a21=21-1/21*3=0,317

Answer 2

решение задания смотри на фотографии

Answer 3

To find the values of the sequence defined by the formula $a_n = \frac{n - 1}{3n}$, we simply need to substitute the values of $n$ into the formula. Let's calculate $a_1$, $a_3$, $a_5$, and $a_{21}$:

1. $a_1$: $a_1 = \frac{1 - 1}{3 \cdot 1} = \frac{0}{3} = 0$

2. $a_3$: $a_3 = \frac{3 - 1}{3 \cdot 3} = \frac{2}{9}$

3. $a_5$: $a_5 = \frac{5 - 1}{3 \cdot 5} = \frac{4}{15}$

4. $a_{21}$: $a_{21} = \frac{21 - 1}{3 \cdot 21} = \frac{20}{63}$

So, the values of the sequence are: $a_1 = 0$ $a_3 = \frac{2}{9}$ $a_5 = \frac{4}{15}$ $a_{21} = \frac{20}{63}$