解题方法
1 . 若
,
,则下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88358272f25c372c5ddf625db4ec0bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0d92e6a1651bd2f30e222b158c39fd.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() |
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解题方法
2 . 如图,是某种型号的家用燃气瓶,其盛气部分近似可以看作由一个半球和一个圆柱体组成,设球的半径为R,圆柱体的高为h,若要保持圆柱体的容积为定值
立方米,则为使制造这种燃气瓶所用材料最省(温馨提示:即由半球和圆柱体组成的几何体表面积最小),此时
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5001011c6f4ea18252efb6feb6e65ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813a8d8a451f15758978f2b99cba2270.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 在平面直角坐标系中,
,
,在
轴正半轴有点
,则
的最大值为___________ ,此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29610a3415c1e795d35979a5a9ff69f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6da2067c7d999cbfed5f504e57e6fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb8a80473da8d3f571def3f3f34086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
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解题方法
4 . 已知等差数列
,正整数
,
,
,
满足
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25bfdb1a27a61169fa2f6d275c968d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d5abe40c3ca643741f386f2646af8cf.png)
A.![]() | B.![]() |
C.![]() | D.以上均不正确 |
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