1 . 用数学归纳法证明:
(
)时,从“
”时,左边应增添的代数式为_______________ .
![](https://img.xkw.com/dksih/QBM/2015/1/14/1571960237998080/1571960243740672/STEM/418b2eb9b9384afeb5afb6b53d314bb2.png?resizew=308)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1571960237998080/1571960243740672/STEM/962dd1cb3ec5406a9936ca9886f3b05c.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2015/1/14/1571960237998080/1571960243740672/STEM/e4812bf05d344274a92b3e1a203aeeb4.png?resizew=107)
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2014·广东东莞·三模
2 . 请阅读下列材料:若两个正实数a1,a2满足
,那么
.
证明:构造函数
,因为对一切实数x,恒有
,所以
,从而得
,所以
.
根据上述证明方法,若n个正实数满足
时,你能得到的结论为__________ .(不必证明)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/0dd4d7ce991546f19f6a97dbef33be3f.png?resizew=72)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/7e48df8a8820490abdcb4482c2000f65.png?resizew=83)
证明:构造函数
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/b8a9564235314a45b00cb9dab7636405.png?resizew=316)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/996c0299014545a68fd65e59fd600e2e.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/fe2a9b1caa404210851f507c89302b21.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/1054c04f751148f388cbdb395984001e.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/7e48df8a8820490abdcb4482c2000f65.png?resizew=83)
根据上述证明方法,若n个正实数满足
![](https://img.xkw.com/dksih/QBM/2014/4/25/1571660382617600/1571660388278272/STEM/be01edb229d945ef8bf6561918dd869a.png?resizew=144)
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3 . 利用数学归纳法证明不等式
的过程中,用
时左边的代数式减去
时左边的代数式的结果为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cd51dd81bf65d36798c29a56ff33b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ba21f3d0cfc86d40e2e06446623ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef7ca2b3e8061384501f668e59696a1.png)
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4 . 用反证法证明命题:“若x>0,y>0 且x+y>2,则
和
中至少有一个小于2”时,应假设____________________ .
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572897521082368/1572897526882304/STEM/ab9baf6177fe48279137f2e31daa17af.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572897521082368/1572897526882304/STEM/158aca16bc6f4e58b7cf892739c3614c.png?resizew=29)
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5 . 用反证法证明命题“若
能被2整除,则
中至少有一个能被2整除”,那么反设的内容是________ .
![](https://img.xkw.com/dksih/QBM/2016/5/23/1572644593278976/1572644599070720/STEM/a9cd2dc015114338bc7b014ca176763a.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/2016/5/23/1572644593278976/1572644599070720/STEM/3a50cb3cb7694aeabe042051c8cf9d97.png?resizew=27)
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6 . 定义
是
的导函数
的导函数,若方程
有实数解
,则称点
,
为函数
的“拐点”.可以证明,任意三次函数
都有“拐点”和对称中心,且“拐点”就是其对称中心,请你根据这一结论判断下列命题:
①存在有两个及两个以上对称中心的三次函数;
②函数
的对称中心也是函数
的一个对称中心;
③存在三次函数
,方程
有实数解
,且点
为函数
的对称中心;
④若函数
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac322fc4206da717226ad89530effdd5.png)
.
其中正确命题的序号为_______ (把所有正确命题的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac282e92da3691942a6ba8511de2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d0c99ddd028f0bc3b1d64924ff0f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1fa6ca9eb7cea9131dad36db6a0ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b589732202941f828016f982c92996b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60a6d986c80039124c8a869b0e481af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012429b7101ba0f84e7b45598ed12db9.png)
①存在有两个及两个以上对称中心的三次函数;
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c087948f0abff7f6b3218860c973f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efc139f70df469a51f530e03c98abaa.png)
③存在三次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a42dfca9f27abe558892fc0b7db96df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb0c68f6e69ab9da3ea2c8c2f48f683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed0aa12ed308e80e35f1bb6101d36d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
④若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b8df99b8a0839cba0eb04427c0a1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac322fc4206da717226ad89530effdd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb688d1f5aa60c67b53486b84f0aa432.png)
其中正确命题的序号为
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13-14高一·全国·课后作业
7 . 证明不等式
﹣
<
﹣
(a≥2)所用的最合适的方法是_____ .
![](https://img.xkw.com/dksih/QBM/2014/12/4/1571916090998784/1571916096782336/STEM/a01896be0851405f9a3cab79606af7e8.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2014/12/4/1571916090998784/1571916096782336/STEM/18815861747241999f7c47ddfca83cbb.png?resizew=20)
![](https://img.xkw.com/dksih/QBM/2014/12/4/1571916090998784/1571916096782336/STEM/e89cb599f6314d84a98b6188780f515b.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2014/12/4/1571916090998784/1571916096782336/STEM/2b521f7fe29e47bcbc12aa270a747d7c.png?resizew=44)
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12-13高三上·福建福州·期末
名校
8 . “无字证明”(proofs without words), 就是将数学命题用简单、有创意而且易于理解的几何图形来呈现.请利用图甲、图乙中阴影部分的面积关系,写出该图所验证的一个三角恒等变换公式:__________________ .
您最近一年使用:0次
2016-12-01更新
|
539次组卷
|
9卷引用:2012届福建省福州市高三第一学期期末质量检测文科数学
(已下线)2012届福建省福州市高三第一学期期末质量检测文科数学(已下线)2012届湖北省襄阳市高三3月调研考试数学理科试卷(已下线)2013-2014学年福建省福州市八县一中高一下学期期末联考数学试卷福建省2016届高三毕业班总复习(三角函数)单元过关平行性测试卷(文科)数学试题福建省2016届高三毕业班总复习(三角函数)单元过关形成性测试卷(理科)数学试题上海市行知中学2018-2019学年高一下学期3月调研数学试题上海市上海外国语大学附属浦东外国语学校2020-2021学年高一下学期期中数学试题(已下线)复习题二3湘教版(2019)必修第二册课本习题第2章复习题
9-10高二下·江苏南通·期末
名校
9 . 请阅读下列材料:若两个正实数
满足
,那么
.证明:构造函数
,因为对一切实数
,恒有
,所以
,从而得
,所以
.根据上述证明方法,若
个正实数满足
时,你能得到的结论为_______ .(不必证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0158862238e250d2a2598b7d4ecd148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469cd7bde8b86abc995debc8f43d504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0e066a31a9c9c18b8c7e0592eee0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45913ffe796167ee33fe1b19a9228b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2e65b8353bf846fafb6baba9a9fa21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53b761aa4be0bb01c5db6552f3a9dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0e066a31a9c9c18b8c7e0592eee0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e29ce68d400ad5228a1c36a4926620.png)
您最近一年使用:0次
2016-12-04更新
|
290次组卷
|
5卷引用:江苏省启东市09-10学年高二下学期期末学生素质考试数学试题(文)
(已下线)江苏省启东市09-10学年高二下学期期末学生素质考试数学试题(文)(已下线)2011届江西省新余四中高三第二次联考数学理卷(已下线)2012届河南省焦作市高三第一次质量检测文科数学试卷2015-2016学年广东惠州一中高二下期中文科数学试卷安徽师范大学附属中学2020-2021学年高二下学期期中文科数学试题