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下列级数中,发散的级数是哪一个()?
A .https://assets.asklib.com/psource/2015102616283362534.jpg
B .https://assets.asklib.com/psource/2015102616283832927.jpg
C .https://assets.asklib.com/psource/2015102616283955626.jpg
[1/n-1/(n+1)]D .https://assets.asklib.com/psource/2015102616283955626.jpg
sin(nπ/3)
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设任意项级数
https://assets.asklib.com/psource/2015102616235960752.jpg
a
n
,若|a
n
|>|a
n+1
|,且
https://assets.asklib.com/psource/2015102616242822803.jpg
a
n
=0,则对该级数下列哪个结论正确()?
A . 必条件收敛
B . 必绝对收敛
C . 必发散
D . 可能收敛,也可能发散
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若级数发散,则的敛散性为()。
A . 一定发散
B . 可能收敛,也可能发散
C . a>0时收敛,a<0时发散
D . |a|<1时收敛,|a|>1时发散
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对于幂级数,其一般项系数开n次方后的极限为无穷大,则该幂级数发散。
A . 正确
B . 错误
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下列级数中,发散的级数是()。
A .https://assets.asklib.com/psource/2015103008482332269.jpg
B .https://assets.asklib.com/psource/2015103008483914892.jpg
C .https://assets.asklib.com/psource/2015103008485398851.jpg
D .https://assets.asklib.com/psource/2015103008490597600.jpg
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若级数
https://assets.asklib.com/psource/2015102616224486454.jpg
a
n
发散,
https://assets.asklib.com/psource/2015102616224486454.jpg
b
n
发散,则有下列中何项结论()?
A .https://assets.asklib.com/psource/2015102616224486454.jpg
(an+bn)发散B .https://assets.asklib.com/psource/2015102616224486454.jpg
nbn发散C .https://assets.asklib.com/psource/2015102616224486454.jpg
(an+bn)收敛、发散不确定D .https://assets.asklib.com/psource/2015102616224486454.jpg
(an-bn)收敛
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若级数发散,级数也发散,则级数必发散.78e24765d01bb54369e9961004c5e936.png9160f48b7d295f530edb84e46a2f94ac.png7dbbf61ac5947b8e7bbf0fed2c3ae877.png
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已知幂级数在处发散,则时,幂级数( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/5754dc1be0d14442a3a1aab9a8d11025.png
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下列级数发散的是( )。
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若级数发散,则级数++…++…发散。( )http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/a95be4d04b8540a2a3d2a382ef950324.png
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调和级数的敛散性是发散
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下列级数中发散的是()。
A.<img src='https://img2.soutiyun.com/shangxueba/ask/1926001-1929000/1928340/ct_jgzjgysm_jgzjgyschoose_00853(20093)1.jpg' />
B.<img src='https://img2.soutiyun.com/shangxueba/ask/1926001-1929000/1928340/ct_jgzjgysm_jgzjgyschoose_00853(20093)2.jpg' />
C.<img src='https://img2.soutiyun.com/shangxueba/ask/1926001-1929000/1928340/ct_jgzjgysm_jgzjgyschoose_00853(20093)3.jpg' />
D.<img src='https://img2.soutiyun.com/shangxueba/ask/1926001-1929000/1928340/ct_jgzjgysm_jgzjgyschoose_00853(20093)4.jpg' />
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已知级数收敛,且u<sub>n</sub>>0,证明级数也收敛.
已知级数<img src='https://img2.soutiyun.com/ask/2020-12-21/977433142323243.png' />收敛,且u<sub>n</sub>>0,证明级数<img src='https://img2.soutiyun.com/ask/2020-12-21/977433151986795.png' />也收敛.
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利用泰勒公式,证明级数收敛,而级数发散.
利用泰勒公式,证明级数<img src='https://img2.soutiyun.com/ask/2020-12-14/97678863136719.png' />收敛,而级数<img src='https://img2.soutiyun.com/ask/2020-12-14/976788643090861.png' />发散.
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讨论级数在哪些x处收敛?在哪些x处发散?
讨论级数<img src='https://img2.soutiyun.com/ask/2020-12-17/9770605337287.png' />在哪些x处收敛?在哪些x处发散?
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设且收敛,则对于任意正数p,级数().A.绝对收敛B.条件收敛C.发散D.敛散性与p有关
设<img src='https://img2.soutiyun.com/ask/2020-12-14/976812927934874.png' />且<img src='https://img2.soutiyun.com/ask/2020-12-14/976812935497307.png' />收敛,则对于任意正数p,级数<img src='https://img2.soutiyun.com/ask/2020-12-14/976812944562825.png' />().
A.绝对收敛
B.条件收敛
C.发散
D.敛散性与p有关
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证明函数项级数上是一致收敛的,其中a是小于的任意固定正数。
证明函数项级数<img src='https://img2.soutiyun.com/ask/2021-01-28/980691494484278.png' />上是一致收敛的,其中a是小于<img src='https://img2.soutiyun.com/ask/2021-01-28/980691504747866.png' />的任意固定正数。
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讨论p级数的敛散性,其中p为任意实数。()A、当p时发散
B、当p时收敛
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证明:将收敛级数相邻的奇偶项交换位置得到的新级数也收敛,且和不变.
证明:将收敛级数<img src='https://img2.soutiyun.com/ask/2020-11-13/974114290584811.jpg' />相邻的奇偶项交换位置得到的新级数也收敛,且和不变.
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设级数的绝对值级数发散,且其发散的结论是由比式判别法或根式判别法得到的,即我们有证明级数一
设级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473223462229.jpg' />的绝对值级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473238100066.jpg' />发散,且其发散的结论是由比式判别法或根式判别法得到的,即我们有<img src='https://img2.soutiyun.com/ask/2021-01-14/979473272654042.jpg' />证明级数<img src='https://img2.soutiyun.com/ask/2021-01-14/979473324430004.jpg' />一定发散。
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设必发散。若这两个级数都发散,上述结论是否成立?
设<img src='https://img2.soutiyun.com/ask/2020-12-22/977477196762504.png' />必发散。若这两个级数都发散,上述结论是否成立?
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若级数[图]an发散,[图]bn发散,则有下列中何项结论()?A...
若级数<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' />a<sub>n</sub>发散,<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' />b<sub>n</sub>发散,则有下列中何项结论()?
A.<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' />(a<sub>n</sub>+b<sub>n</sub>)发散
B.<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' /><sub>n</sub>b<sub>n</sub>发散
C.<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' />(a<sub>n</sub>+b<sub>n</sub>)收敛、发散不确定
D.<img src='https://img2.soutiyun.com/shangxueba/ask/17670001-17673000/17671850/2015102616224486454.jpg' />(a<sub>n</sub>-b<sub>n</sub>)收敛
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对于级数习下列结论中正确的是().A.a>1时,级数收敛B.a<1时,级数发散C.a=1时,级数收敛D.a=1时,
对于级数习<img src='https://img2.soutiyun.com/ask/2020-12-07/976201851181314.png' />下列结论中正确的是().
A.a>1时,级数收敛
B.a<1时,级数发散
C.a=1时,级数收敛
D.a=1时,级数发散
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幂级数在()绝对收敛,在()发散。
幂级数<img src='https://img2.soutiyun.com/ask/2020-12-14/976814121928167.jpg' />在()绝对收敛,在()发散。