1 . 如图所示的“数字塔”有以下规律:每一层最左与最右的数字均为2,除此之外每个数字均为其两肩的数字之积,则该“数字塔”前10层的所有数字之积最接近
( )
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441311607185408/2442599023460352/STEM/4331bc4f32aa4a84b3288d3009a91a7c.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d5634ea88a01ce460e6efa61ddc33d.png)
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441311607185408/2442599023460352/STEM/4331bc4f32aa4a84b3288d3009a91a7c.png?resizew=146)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-04-16更新
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866次组卷
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7卷引用:湖北省襄阳市第四中学2021-2022学年高三上学期期中数学试题
2 . 设
是
的导函数,
是
的导函数,若函数
在区间
上恒有
,则称
是区间
上的凸函数,则下列函数在
上是凸函数的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a20f241fe608738e3a29b43a4c55421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0959e7e1dc5b929b82e058c4e209b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a20f241fe608738e3a29b43a4c55421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdce8cc3550f7fb7bb7c8acd0401b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291d664e9ea8088c35bb6b0550f18675.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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