解题方法
1 . 判断正误(正确的填“正确”,错误的填“错误”)
(1)当
时,
为递增数列.( )
(2)当
时,
为常数列.( )
(3)
是等比数列,若
,则
.( )
(4)若等比数列
的公比是
,则
(
).( )
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa9bf65189dfb57a61644a1cb27f361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9b26b74b54a192806097b698fac864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d2e59aeab922d37da08fd7c9f517ba.png)
(4)若等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661f8c3fabb7391571e555c2d325ab81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38b6286e5f74b604b9fb639c55d611f.png)
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2 . 判断正误,正确的写正确,错误的写错误.
(1)1,1,1,1是一个数列.( )
(2)数列1,3,5,7可表示为
.( )
(3)如果一个数列不是递增数列,那么它一定是递减数列.( )
(4)
与
表达不同的含义.( )
(5)数列中的项互换次序后还是原来的数列.( )
(6)所有的数列可分为递增数列和递减数列两类.( )
(7)
与
的意义一样,都表示数列.( )
(1)1,1,1,1是一个数列.
(2)数列1,3,5,7可表示为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602cc5f160a2531da06be7fb0de74f4d.png)
(3)如果一个数列不是递增数列,那么它一定是递减数列.
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(5)数列中的项互换次序后还是原来的数列.
(6)所有的数列可分为递增数列和递减数列两类.
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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