解题方法
1 . 判断正误(正确的填“正确”,错误的填“错误”)
(1)对任意
,
均成立.( )
(2)若
,则
.( )
(3)
异号时,
.( )
(4)当
时,
的最小值为2.( )
(1)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bcce6eb3b38322059b6051ce600ee8b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dfa55731858aaed472d94ba55af2cc4.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37006891004d02050e7c57db20af3981.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27f27cbb8185c1974d715ff95f8801c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f40c24c64bbb0645fcf585f4e66872.png)
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解题方法
2 . 已知函数
(n为正整数),有下列四种说法:
①函数
始终为奇函数;
②当n为偶数时,函数
的最小值为8;
③当n为奇数时,函数
的极大值为
;
④当
时,函数
的图像关于直线
对称.
其中所有正确说法的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f898761ca2ed7eb2b14b1fe1a0a0db72.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
②当n为偶数时,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③当n为奇数时,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf3d3564c61e5e9c39a9e2cf2de048b.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
其中所有正确说法的序号是( )
A.①② | B.②③ | C.②④ | D.③④ |
您最近一年使用:0次
2021-07-23更新
|
671次组卷
|
3卷引用:辽宁省协作校2020-2021学年高二下学期期末考试数学试题
辽宁省协作校2020-2021学年高二下学期期末考试数学试题辽宁省抚顺二中、沈阳二中等2020-2021学年高二下学期期末考试数学试题(已下线)专题08 无处不考的函数性质问题-备战2022年高考数学一轮复习一网打尽之重点难点突破
解题方法
3 . 判断正误(正确的打正确,错误的打错误)
(1)对任意
均成立.( )
(2)若
且
,则
.( )
(3)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3827ed33eeca93ecd65f9633de230d.png)
( )
(4)
同号时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa23408bcc9f6200f22a310e5f2569a.png)
( )
(1)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b2999298af989cf5cebd29c8aab27f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ec5317c2642bca22a5814e21494acd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3827ed33eeca93ecd65f9633de230d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa23408bcc9f6200f22a310e5f2569a.png)
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4 . 判断正误(正确的填“正确”,错误的填“错误”)
(1)两个不等式
与
成立的条件是相同的.( )
(2)当
时,
.( )
(3)当
时,
.( )
(4)函数
的最小值是2.( )
(1)两个不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fe5d9cbe4f83926f5c21912df67a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689f982af451283289255c87593ec338.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759c09917e5728d75bf5cfdb5b4a807f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3827ed33eeca93ecd65f9633de230d.png)
(4)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1305b9abebd7bef3171486df157286b3.png)
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解题方法
5 . 判断正误(正确的写“正确”,错误的写“错误”)
(1)若两个正数的和为定值,则它们的积有最大值.( )
(2)x∈R,则
的最小值是2.( )
(3)若x>0,则函数
的最小值等于
.( )
(4)已知函数
存在最大值,若不等式
恒成立,则
.( )
(1)若两个正数的和为定值,则它们的积有最大值.
(2)x∈R,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60c0b7c58c3c45581dbca3e6dca34f1.png)
(3)若x>0,则函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01798070ecd1c824b0a8b8566625606e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143aca2ea7b880e70eb3ecaedc5f9c50.png)
(4)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb1fa6b43e76575833ff732190cda49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e6b93427826fcbb48f8cdfc54fcb17.png)
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6 . 数学中有许多形状优美、寓意美好的曲线,曲线
就是“心形”曲线.给出以下列两个结论:
①曲线
恰好经过6个整点(即横、纵坐标均为整数的点);
②曲线
上任意一点到原点的距离都不超过
;
则正确的判断是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6fea8eb5-9b2c-4524-a34a-baaf6d03d853.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec03995f3d289f47654e71af0affde19.png)
①曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
则正确的判断是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6fea8eb5-9b2c-4524-a34a-baaf6d03d853.png?resizew=151)
A.①正确②错误 | B.①错误②正确 |
C.①②都错误 | D.①②都正确 |
您最近一年使用:0次
2022-12-05更新
|
275次组卷
|
3卷引用:上海市控江中学2020-2021学年高二上学期期末数学试题
7 . 下列说法中:
①命题“对任意的
,有
”的否定为“存在
,有
”;
②“对于任意的
,总有
(
为常数)”是“函数
在区间
上的最小值为
”的必要不充分条件;
③若
,
,则函数
满足
;
④若
,
,
,则函数
满足
.
所有正确说法的序号______ .(把满足条件的序号全部写在横线上)
①命题“对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a79d7f73b6128650bf7aed538260c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/717e338241e8bb69490fa4c1c1667dc6.png)
②“对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2402277de61291ce71091791a341d4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eace660471b61d7ac55cb51ed555c0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2054e0dc7153871a51a8753cd5c73735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db10f7b8f7aa0d45a696e15852673326.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33890c6b0bf167514d44139d9dca0154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5bf1fbb7d7339058beb960a4c6ae5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4ed15e6afa80e85571fb30aba57f96.png)
所有正确说法的序号
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解题方法
8 . 有这样一道利用基本不等式求最值的题:
已知
且
求
的最小值.
小明和小华两位同学都“巧妙地用了
”,但结果并不相同.
小明的解法:由于
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aa5eb4249cc659809767bb1650cfbe.png)
而
那么
则最小值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474bd808b81bce2d61dc8b95d0c740b6.png)
小华的解法:由于
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c9fc2869dcc1ae6d913b5db300f43c.png)
而
则最小值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172681503b639df2b7dac358af9e9b06.png)
(1)你认为哪位同学的解法正确,哪位同学的解法有错误?
(2)请说明你判断的理由.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34c590f48c84fe471d1af522c343c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d575bf340fd6486b3173ba6adc7d027f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e85107c8abd4a977590d7c038ed127a.png)
小明和小华两位同学都“巧妙地用了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
小明的解法:由于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d575bf340fd6486b3173ba6adc7d027f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aa5eb4249cc659809767bb1650cfbe.png)
而
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c869e5b4206749e1bdac5d6a87353276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ad92003a4e0e1544d98a8748f20711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474bd808b81bce2d61dc8b95d0c740b6.png)
小华的解法:由于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d575bf340fd6486b3173ba6adc7d027f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c9fc2869dcc1ae6d913b5db300f43c.png)
而
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a232ed285d1569176a42ea0b6bae746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172681503b639df2b7dac358af9e9b06.png)
(1)你认为哪位同学的解法正确,哪位同学的解法有错误?
(2)请说明你判断的理由.
您最近一年使用:0次
2021-10-21更新
|
367次组卷
|
3卷引用:甘肃省嘉峪关市第一中学2020-2021学年高一下学期期末数学试题
9 . 对于问题“已知正数x、y满足
,求
的最小值.”同学小明有如下解法:
因为
,
,
所以
,即
.
由
,得所求最小值为
.
试判断上述解法是否正确.若不正确,请指出错误之处,并加以改正.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a945b19a5442a7edfa8d0f1d4ef488da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0bd65eb59d0acde6f5955490696c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2af418f4ff709e05cf605beb578fdc4.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8c88c4d36a8ec20512e3473503a188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea1b8cd4d4ebaeccbbfd256a0c838f7.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b577f35127f9fe273540f70627053f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
试判断上述解法是否正确.若不正确,请指出错误之处,并加以改正.
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解题方法
10 . 在
中,角A,B,C的对边分别为a,b,c,已知
,
,下列判断:①若
,则角C有两个解;②若
,则AC边上的高为
;③
可能是9.其中判断正确的序号是_____ (写出所有正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e29b822cda1ba926e96368094fa1a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45be552695f7ca2bdc00cd7d7cef068f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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