名校
解题方法
1 . 定义空间中既有大小又有方向的量为空间向量.起点为
,终点为
的空间向量记作
,其大小称为
的模,记作
等于
两点间的距离.模为零的向量称为零向量,记作
.空间向量的加法、减法以及数乘运算的定义与性质和平面向量一致,如:对任意空间向量
,均有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bcfdf754e71318fb8329b8e7c09264.png)
,
,
;对任意实数
和空间向量
,均有
;对任意三点
,均有
等.已知体积为
的三棱锥
的底面均为
,在
中,
是
内一点,
.记
.
(1)若
到平面
的距离均为1,求
;
(2)若
是
的重心,且对任意
,均有
.
(i)求
的最大值;
(ii)当
最大时,5个分别由24个实数组成的24元数组
满足对任意
,均有
,且对任意
均有
求证:
不可能对任意
及
均成立.
(参考公式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c082be7f93f355e1ca70588a4a89aead.png)
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fde0a8b4ec1e2fff42cee3fc54c0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fde0a8b4ec1e2fff42cee3fc54c0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49da589810153e2ec39ed656a2b61f4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12de8a4f788ff23d36e74c811354779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e12e95f703ad30ab9a3d38376830989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bcfdf754e71318fb8329b8e7c09264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3ff5e2f25dfebafaf8db07712ff706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff47a4801df7bc7bce1cb52327a7b174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e0a953946d9e878aa017c7f24ffb40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0714b48d55f6b0854fb90a4255bc49c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa157b4f65f3a9aa1f7f82de02e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1e19465c82977a26ca6900622ee1bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718ba76bf48024ca425948e470e60042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761455094dc4913de76122017a243dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48ac6b0dda0647d7dad3287ce4ad258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d131fd570dc36b912396dc2dd06405c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4aeda1e642ce85f1c0394bc419bda8e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49f84442a1b38f27ac977214cd4b688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902a402a179a09f74f2391fb5cb4ae6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247daad150250fc13a230d5375adda93.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(ii)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab39849dc21c8c68cd5cde0911d5db23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61e6011a0717ef57516821d0407a656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae3155971b2bb3c9d68b43e14b7186f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ffe9f4e3243bd760835af03fa7ffe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c053ebe33366203ad0eca474760118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d05f59bfd6b1f55920e73653bf87a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ffe9f4e3243bd760835af03fa7ffe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db09e9844b90e46a6f2f5a710b6a3451.png)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c082be7f93f355e1ca70588a4a89aead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2343b61be295955a2b9baea86202f32.png)
您最近一年使用:0次
2024-06-13更新
|
353次组卷
|
2卷引用:重庆市巴蜀中学校2023-2024学年高一下学期5月期中考试数学试题
名校
解题方法
2 . 满足下列条件的四面体存在的是( )
A.1条棱长为![]() | B.1条棱长为1,其余5条棱长均为![]() |
C.2条棱长为![]() | D.2条棱长为1,其余4条棱长均为![]() |
您最近一年使用:0次
2024-06-13更新
|
356次组卷
|
2卷引用:重庆市巴蜀中学校2023-2024学年高一下学期5月期中考试数学试题
名校
解题方法
3 . 已知函数
,将
的图像上所有点的横坐标变为原来的2倍,再向左平移
个单位长度,最后再把所有点的纵坐标伸长到原来的3倍,得到函数
的图象.
(1)求函数
的单调递增区间,并写出函数
的解析式;
(2)关于
的方程
在
内有两个不同的解
;
①求实数
的取值范围;
②用
的代数式表示
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7ecff5c4200875c7655e505c57a103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
(2)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7317f1f5bf19007cbf9bf46d1e4bcac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e13623a74057edba789cff4ba85c5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146b7c16d81ccb92aef1e1f1788f00f.png)
①求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7241924141a25c43d7cd8288ddfd8501.png)
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解题方法
4 . 我们知道,一个一元一次方程最多有一个根,一个一元二次方程最多有两个根,这些都是代数基本定理的简单表示,代数基本定理可以表述为:一元n次多项式方程最多有
个不同的根.由代数基本定理可以得到如下推论:若一个一元
次方程有不少于
个不同的根,则必有各项的系数均为0.已知函数
,函数
的图象上有四个不同的点A、B、C、D.利用代数基本定理及其推理回答下列问题:
(1)解关于x的方程
;
(2)是否存在实数
,使得关于
的方程
有三个以上不同的解,若存在,求出
的值,若不存在,请说明理由;
(3)若
按逆时针方向顺次构成菱形,设
,求代数式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8a18548e00a131abe2eca8c4c815c2.png)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0876215b2fd463d151523cd3c6b447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7bc57a9ac3f82c3b8af4fe78e5c861b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)解关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b070bfc31cef4c001541af54d3c36cd3.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2158cfb945452be603a745510df299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0877194ab8760f54c35527177b03ff93.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b032796d46540441098204aa82c12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8a18548e00a131abe2eca8c4c815c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c004d926a934cced9bc523a8ecde1df1.png)
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解题方法
5 . 炎炎夏日,上学路上若有一支冰淇淋该多么美妙啊!小明同学酷爱甜筒冰淇淋(图1),他想动手做一个甜筒模型(图2),若根据设计稿已知
为直角三角形,四边形
为直角梯形,
,
,曲线
是以
为圆心的四分之一圆弧,
,
,
,
,将平面图形
旋转一周得到小明设计的甜筒.
;
(2)小明准备将矩形
旋转所形成的几何体都用来盛装冰淇淋(如图2所示),该矩形内接于图形
,
在弧
上(不与端点
重合),点
在线段
上,
与
所在的直线重合,设
,求:
①盛装冰淇淋容器的体积
;(用
表示)
②炎热的天气下,若冰淇淋融化的时间与盛装的体积满足关系
,请计算这个冰淇淋完全融化需要的最长时间.
(3)小明想给甜筒一些新的装饰,如果修改后的甜筒俯视图如图3所示,且通过拼装后可以变成一个正四棱锥
(即俯视图可以看作一个正四棱锥
的展开图),我们记侧棱
的长为1,
,正四棱锥的表面积记作
,体积记作
.求
(将其表示为
的形式,其中
为常数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1333acc72211e3ddb9a0f8c726ce8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f90126f831d6600522ecaa66c2a8b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4465a96d65de0f859ea4ec9e548204d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
(2)小明准备将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec780e86f57790cf88ec761e219bf5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaecff592cf677f45d8c54340a89f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1494be0926832f8cb95cbc7477ae685.png)
①盛装冰淇淋容器的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②炎热的天气下,若冰淇淋融化的时间与盛装的体积满足关系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698295b8bd91909e0dbb581fe29a9bd0.png)
(3)小明想给甜筒一些新的装饰,如果修改后的甜筒俯视图如图3所示,且通过拼装后可以变成一个正四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965466f8aae61f1a049e25f0325d4abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d887c94a751c97fc17d9ee6dba8590b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46dc1a9783d9539ae3b0d2049bf1a123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb84bef0f93107237d2860f477288d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715f6103c80ca9f2c1c88b1308e33704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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解题方法
6 . 学习以下过程:若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35426df35d0b2eae48af24f5e029b8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fc32806172f394bbde81797aefcd82.png)
,完成下面题目:已知
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c96adab43f4e12950ff28ec902e9993.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1018d072c74bd0f5f013002751e16668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fda0241d8ec426980f1d0d952e7eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35426df35d0b2eae48af24f5e029b8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fc32806172f394bbde81797aefcd82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113d9ba315ee03796ed4993d823bf855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd40ca9cbe17fe92d0e9f1f1c8cacf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a18cb53580e8d0e288de7ede303fc78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c96adab43f4e12950ff28ec902e9993.png)
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解题方法
7 . 下列选项中,
是
的必要不充分条件的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() ![]() ![]() |
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8 . 给出以下四个命题:
①斜棱柱的侧面展开图一定是一个平行四边形;
②若直线
与直线
异面,且
平面
,则
与
的位置关系是平行或相交;
③如果两条平行线中有一条平行于这个平面,那么另外一条直线也平行于该平面;
④若正方体的截面形状是四边形,则该四边形必有一组边平行.
其中正确的命题是______ .(填写序号).
①斜棱柱的侧面展开图一定是一个平行四边形;
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaf5492ffc6db02fd5968b643c8b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
③如果两条平行线中有一条平行于这个平面,那么另外一条直线也平行于该平面;
④若正方体的截面形状是四边形,则该四边形必有一组边平行.
其中正确的命题是
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名校
解题方法
9 . 在探究
的展开式的二项式系数性质时,我们把系数列成一张表,借助它发现了一些规律.在我国南宋数学家杨辉1261年所著的《详解九章算法》一书中,出现了这个表,我们称这个表为杨辉三角.杨辉三角是中国古代数学中十分精彩的篇章.杨辉三角如下图所示:
第0行 1
第1行 1 1
第2行 1 2 1
第3行 1 3 3 1
第4行 1 4 6 4 1
第5行 1 5 10 10 5 1
第6行 1 6 15 20 15 6 1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
如上图,杨辉三角第6行的7个数依次为
,
,
…
,
.现将杨辉三角中第
行的第
个数乘以
,第0行的一个数为0,得到一个新的三角数阵如下图:
第0行 0
第1行 0 1
第2行 0 2 2
第3行 0 3 6 3
第4行 0 4 12 12 4
第5行 0 5 20 30 20 5
第6行 0 6 30 60 60 30 6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
在这个新的三角数阵中,第10行的第3个数为________ ;从第一行开始的前
行的所有数的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9216a0f9d6e65ea4937ab7bf102c5db.png)
第0行 1
第1行 1 1
第2行 1 2 1
第3行 1 3 3 1
第4行 1 4 6 4 1
第5行 1 5 10 10 5 1
第6行 1 6 15 20 15 6 1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
如上图,杨辉三角第6行的7个数依次为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c157f0f16f099230f1831cff5a3aae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14ad7c0d051c4a14c35ba35bd8e6675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88120a74c84c257915b5c060e503008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dc96c400e9f6aa2f55f646c427e02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59cfd02b309dbdda35440c860bac311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8a7c6d10fc680085289ed89f2b4878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35994cf95c433ff61cdcc6345acc53f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db68583bc5ded5e0cf7028c0fd4297ab.png)
第0行 0
第1行 0 1
第2行 0 2 2
第3行 0 3 6 3
第4行 0 4 12 12 4
第5行 0 5 20 30 20 5
第6行 0 6 30 60 60 30 6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed8181dab2251aad31eef4d43413cf8.png)
在这个新的三角数阵中,第10行的第3个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b568d18fba797efb24d3baf3be98768b.png)
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10 . 若函数
的导函数
在点
可导,则称
在点
的导数值为
在点
的二阶导数,记作
.若
在开区间I内的每一点都二阶可导,则得到一个定义在I上的二阶导函数,记作
.曲线
上任意两点间的弧段总在这两点的下方;而曲线
则相反,任意两点间的弧段总在这两点连线的上方.我们把具有前一种特性的曲线称为凸的,相应的函数称为凸函数;后一种曲线称为凹的,相应的函数称为凹函数.连续曲线上凹弧与凸弧的分界点称为曲线的拐点.拐点在统计学,物理学,经济学领域都有重要的应用.若函数
在定义域内是一条连续不断的曲线,对任意的
,
的导函数
都存在,且
的导函数
也都存在,若
,使得
,且在
的左右附近,
异号,则称点
为曲线
的拐点.已知函数
,
,
.
(1)求
在定义域内的拐点个数;
(2)若
在
上有唯一拐点
,求实数k的取值范围;
(3)函数
在区间
恰有一个拐点,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac282e92da3691942a6ba8511de2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac282e92da3691942a6ba8511de2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef469c7b7cb9945b984222381b9c000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268ea7b6a873194253b75233ac18545a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac282e92da3691942a6ba8511de2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a09c048d8ea4456b9db662b39d3a208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd16646e695eeb7088134cb94d51691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac282e92da3691942a6ba8511de2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8559f5db9b978cb2bd290dbce7268629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2430fa48f248e998e256e91165970bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d74fb771e771f22b7e4249da06289e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a63eed6f348f10044c48dacb045b7b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3ac8b888cea3c2a212f4b21447d3bd.png)
(3)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2629d7ba67bc8caed81c64c3c1341275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
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