又正數(shù).則必有. 查看更多

 

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在數(shù)列中,若都有為常數(shù)),則稱為“等方差數(shù)列”.下列是對“等方差數(shù)列”的判斷,正確命題序號為                 .

(1)若數(shù)列是等方差數(shù)列,則數(shù)列是等差數(shù)列;

(2)數(shù)列是等方差數(shù)列;

(3)若數(shù)列既是等方差數(shù)列,又是等差數(shù)列,則該數(shù)列必為常數(shù)列;

(4)若數(shù)列是等方差數(shù)列,則數(shù)列為常數(shù),也是等方差數(shù)列.

 

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在數(shù)列中,若都有為常數(shù)),則稱為“等方差數(shù)列”.下列是對“等方差數(shù)列”的判斷,正確命題序號為                 .

(1)若數(shù)列是等方差數(shù)列,則數(shù)列是等差數(shù)列;

(2)數(shù)列是等方差數(shù)列;

(3)若數(shù)列既是等方差數(shù)列,又是等差數(shù)列,則該數(shù)列必為常數(shù)列;

(4)若數(shù)列是等方差數(shù)列,則數(shù)列為常數(shù),也是等方差數(shù)列.

 

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在數(shù)列中,若都有為常數(shù)),則稱為“等方差數(shù)列”.下列是對“等方差數(shù)列”的判斷:

(1)若數(shù)列是等方差數(shù)列,則數(shù)列是等差數(shù)列;

(2)數(shù)列是等方差數(shù)列;

(3)若數(shù)列既是等方差數(shù)列,又是等差數(shù)列,則該數(shù)列必為常數(shù)列;

(4)若數(shù)列是等方差數(shù)列,則數(shù)列為常數(shù),也是等方差數(shù)列.

則正確命題序號為                 .

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在數(shù)列{an}中,若都有a-a=p(n≥2,n∈N*)(p為常數(shù)),則稱{an}為“等方差數(shù)列”.下列是對“等方差數(shù)列”的判斷:

(1)若數(shù)列{an}是等方差數(shù)列,則數(shù)列{a}是等差數(shù)列;

(2)數(shù)列{(-1)n}是等方差數(shù)列;

(3)若數(shù)列{an}既是等方差數(shù)列,又是等差數(shù)列,則該數(shù)列必為常數(shù)列;

(4)若數(shù)列{an}是等方差數(shù)列,則數(shù)列{akn}(k為常數(shù),k∈N*)也是等方差數(shù)列.

則正確命題序號為________

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等比數(shù)列{an}的公比為q,則“a1>0,且q>1”是“對于任意正自然數(shù)n,都有an+1>an”的


  1. A.
    充分非必要條件
  2. B.
    必要非充分條件
  3. C.
    充要條件
  4. D.
    既非充分又非必要條件

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