在
中内角
的对边分别为
,若
,则
的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b269069e460c7ab1d90ee9bac7bd876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
更新时间:2022-06-16 18:30:10
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解题方法
【推荐1】对于任意的
恒成立,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae71ca220cf385a9ed695ed78902058d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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填空题-双空题
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(0.65)
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【推荐2】设函数
.
(1)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e46d0336ea9893b942b928a9ee57a1c.png)
___________
(2)函数
的值域为__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f3dc5ea151914f1074122c423e4a17f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232725e55a716a1d110c4a174305de7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e46d0336ea9893b942b928a9ee57a1c.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab02d4ef93d85e1966be77261160f374.png)
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【推荐3】已知
,则
的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab16a624d648bdb9028169c5e17444c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e7df1efcc3e1b2ebab4002d1ef9134.png)
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解题方法
【推荐1】若
的面积为
,且
为钝角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
_________ ;
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b46b9e5e91df1586154167aa82938a.png)
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您最近一年使用:0次
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【推荐2】下列4个命题:
①“若
成等比数列,则
”的逆命题;
②“如果
,则
”的否命题;
③在
中,“若
”则“
”的逆否命题;
④当
时,若
对
恒成立,则
的取值范围是
.
其中真命题的序号是__________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eecf783b0385c573f96e497f7399d038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c8379fe535e68721fd84be969d257f.png)
②“如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566ee5d2d5029fe2b63838ede01cecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c89eab34f319912ed5efb3f6f4592c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b47b356d21713e8956a6d8791144423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff39e9af126fd7f909437e2a0f35324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa79d0700ed2cf5418f2cd4f2a371922.png)
其中真命题的序号是
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解题方法
【推荐1】抛物线
的焦点F,点A,B在抛物线上,且
,弦AB的中点M在准线上的射影为N,则
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
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【推荐2】小明研究三棱锥的时候,发现下面一个真命题:在三棱锥
中,已知
,
(如图),设二面角
大小为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7038a3e4975c5200d16803885eef7b3.png)
,其中
是一个与
有关的代数式,请写出符合条件的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f06ccfb4be29066173ea68af36fb.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
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