解题方法
1 . 下列选项中说法正确的是( )
A.函数![]() ![]() |
B.一四面体不是正四面体,那该四面体最多有3个面全等 |
C.![]() ![]() ![]() ![]() ![]() ![]() |
D.![]() ![]() |
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2 . 已知
,
,不等式
恒成立时,实数a的取值集合记为M.若“
”的必要不充分条件是“
”,则集合N可以为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd86bb872c532ab33e10269b91ca7f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc595518cf752e1c7903dfff93dbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca06304795e9c2c1fd0b4a52eb8d5b9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . (1)若
,求
的最小值;
(2)若
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313fbfc0f3b2cd46ca436ab3f509af2b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23eede15bfecfcefaced07619975c571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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