P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
P 0.1 Stabilişti natura şsi suma seriilor: a) Σ 1 n\ ; b) Σ arctan 1 n# + n ...
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2<br />
P 0.4 Stabili¸ti <strong>natura</strong> <strong>seriilor</strong>:<br />
1X 100<br />
a)<br />
n<br />
;<br />
n!<br />
1X (n!)<br />
b)<br />
2<br />
;<br />
(2n)!<br />
1X<br />
c)<br />
f)<br />
o)<br />
n=1<br />
1X<br />
n=1<br />
k)<br />
m)<br />
1X<br />
n=1<br />
(n!) 2<br />
2 n2 ; g)<br />
1X<br />
n=1<br />
1X<br />
n=1<br />
2<br />
n=1<br />
1X<br />
n=1<br />
3p 2 2<br />
1<br />
(2n2 + n + 1) n+1<br />
2<br />
3p n 3 + n 2 + 1<br />
n=1<br />
n!<br />
; d)<br />
nn 1X<br />
n=1<br />
100 101 ::: (100 + n)<br />
; h)<br />
1 3 ::: (2n 1)<br />
5p 2 ::: 2<br />
; n)<br />
1X<br />
n=1<br />
2n+1 p 2 ; l)<br />
3p n 3 n 2 + 1 n<br />
; p)<br />
2 n n!<br />
n n ; e)<br />
1X<br />
n=1<br />
1X<br />
n=1<br />
1 3 + 2 3 + ::: + n 3<br />
n 3<br />
1X<br />
n=1<br />
P 0.5 Stabili¸ti <strong>natura</strong> seriei cu termenul general<br />
un =<br />
n n+1<br />
e n (n + 1)! :<br />
P 0.6 Pentru …ecare a > 0; studia¸ti <strong>natura</strong> seriei:<br />
1X 1<br />
a)<br />
an ;<br />
+ n<br />
1X a<br />
b)<br />
n<br />
p ;<br />
n!<br />
1X<br />
c)<br />
e)<br />
1X<br />
n=1<br />
n=1<br />
n2 + n + 1<br />
n2 a<br />
n=1<br />
n<br />
; f)<br />
1X<br />
n=1<br />
n=1<br />
3n 2n ; g)<br />
+ an a ln n ; d)<br />
1X<br />
n=1<br />
3 n n!<br />
n n ;<br />
4 7 ::: (4 + 3n)<br />
2 6 ::: (2 + 4n) ;<br />
n 2<br />
2 + 1<br />
n<br />
n<br />
4<br />
(3n) 2<br />
n ;<br />
n<br />
;<br />
q<br />
(16n 2 + 5n + 1) n+1<br />
1X<br />
n=1<br />
P 0.7 Pentru …ecare a; b > 0; studia¸ti <strong>natura</strong> seriei:<br />
1X<br />
a)<br />
1X<br />
1X<br />
n=1<br />
an an ; b)<br />
+ bn d)<br />
n=1<br />
1X<br />
n=1<br />
n=1<br />
2n an ; c)<br />
+ bn n=1<br />
(2a + 1) (3a + 1) (na + 1)<br />
(2b + 1) (3b + 1) (nb + 1) :<br />
1X<br />
n=1<br />
an ;<br />
nn p p<br />
n + 1 n<br />
na :<br />
anbn an ;<br />
+ bn P 0.8 Pentru …ecare a; b 2 R, a > 0; stabili¸ti <strong>natura</strong> seriei:<br />
1X (a + 1) (a + 2)<br />
n!<br />
(a + n) 1<br />
:<br />
nb :