16.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 . 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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給出定義:在數(shù)列{an}中,都有
a2n
-
a2n-1
=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)數(shù)列{an}是等方差數(shù)列,則數(shù)列{
a2n
}
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)數(shù)列;
(4)若數(shù)列{an}是等方差數(shù)列,則數(shù)列{akn}( k∈N*,k為常數(shù))也是等方差數(shù)列.
其中正確命題序號為______.

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(2009•湖北模擬)給出定義:在數(shù)列{an}中,都有
a
2
n
-
a
2
n-1
=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)數(shù)列{an}是等方差數(shù)列,則數(shù)列{
a
2
n
}
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)數(shù)列;
(4)若數(shù)列{an}是等方差數(shù)列,則數(shù)列{akn}(k∈N*,k為常數(shù))也是等方差數(shù)列.
其中正確命題序號為
(1)(2)(3)(4)
(1)(2)(3)(4)

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在數(shù)列中,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)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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