Numerikus sorok - Index of
Numerikus sorok - Index of
Numerikus sorok - Index of
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Feladatok<br />
Vizsgálja meg konvergencia szempontjából az alábbi <strong>sorok</strong>at!<br />
1.<br />
∞∑<br />
1<br />
1<br />
3n + 2<br />
8.<br />
∞∑<br />
1<br />
2 n + 3 n<br />
6 n + 2 n+1<br />
2.<br />
∞∑<br />
2<br />
1<br />
n 2 − √ n<br />
9.<br />
∞∑<br />
1<br />
3 n + n<br />
n · 4 n − 3<br />
3.<br />
∞∑<br />
2<br />
1<br />
n 2 log 2 n<br />
10.<br />
∞∑<br />
1<br />
( 1 + n<br />
1 + n 2 ) 2<br />
4.<br />
∞∑<br />
2<br />
1<br />
n log 2 n 2<br />
11.<br />
∞∑<br />
1<br />
7n 5 − 2n 3 + 1<br />
n 6 + 3n 2 − √ n<br />
5.<br />
∞∑<br />
1<br />
2 n<br />
2 n+2 − 3<br />
12.<br />
∞∑<br />
1<br />
7n 5 − 2n 3 + 1<br />
n 7 + n 2 − n + 3<br />
6.<br />
7.<br />
∞∑<br />
1<br />
∞∑<br />
1<br />
2 n<br />
2 2n − 3<br />
2 2n<br />
2 n − 3<br />
13.<br />
14.<br />
∞∑<br />
1<br />
7n 5 + n 3 + 1<br />
n 8 − n 2 + 3<br />
( ∞∑ n<br />
( 2)<br />
n<br />
4)<br />
6<br />
5.3. Hányados kritérium<br />
✎☞<br />
T1<br />
✍✌<br />
✎☞<br />
✍✌<br />
1. (a n > 0, ∀ n) ∧<br />
2. (a n > 0, ∀ n) ∧<br />
(<br />
an+1<br />
a n<br />
(<br />
an+1<br />
a n<br />
B<br />
1. Mivel a n+1 ≤ q a n ≤ q 2 a n−1 ≤ q 3 a n−2 ≤ · · · ≤ q n a 1 , ∀ n , ezért<br />
)<br />
≤ q < 1, ∀ n<br />
)<br />
≥ q ≥ 1, ∀ n<br />
=⇒<br />
=⇒<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
a n<br />
a n<br />
konvergens.<br />
divergens.<br />
c○ Kónya I. – Fritz Jné – Győri S. 15 v1.4