解题方法
1 . 已知当
时,不等式
恒成立,则实数a的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b6ce9accae1555dce9a443fda05acc.png)
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2 . 在
中,三个内角
所对的边分别为
.已知
的面积为
,
.
(1)求
的值
(2)求
的最小值.
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf8c9594a0dc9767b5e84b9d55c5d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24eb259fab57e11a4b98d4448a0e65fe.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6732580ffff616408c0985d7175a4c2.png)
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3 . 已知
,
是椭圆和双曲线的公共焦点,P是它们的一个公共点,且
,若椭圆的离心率为
,双曲线的离心率为
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7285470bf401f5edaac641234ee6ff6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b055d52deda0adccaa36156c8fd16298.png)
A.![]() | B.![]() | C.![]() | D.4 |
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4 . 对任意
,不等式
恒成立,则实数a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eac2b31a19918895e5af2d316490e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45256bc50846ff052fd5621be50972c.png)
A. ![]() | B.![]() |
C.![]() | D.![]() |
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5 . (1)篮球运动员甲投篮一次得3分的概率为
,得2分的概率为
,得0分的概率为0.5(投篮一次得分只能为3分,2分,1分或0分),其中
,已知甲投篮一次得分的数学期望为1.
ⅰ)求
的最大值;
ⅱ) 求
的最小值;
(2)有甲、乙两个鱼缸,甲鱼缸中有
条金鱼和
条锦鲤,乙鱼缸中有4条金鱼和3条锦鲤,先从甲鱼缸中随机捞出一条鱼放入乙鱼缸,再从乙鱼缸中随机捞出一条鱼,若从乙鱼缸中捞出的是金鱼的概率为
,求
的最小值;
(3)总结用基本不等式求最值的条件和方法.
![](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/367658f927132c870bd5316ef30a1605.png)
ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
ⅱ) 求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7085101464667694a0a0b6e49768f65a.png)
(2)有甲、乙两个鱼缸,甲鱼缸中有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa5a1a2ee471c67aa5264c0991d05421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483bd525deb09a595f5a791a071588b1.png)
(3)总结用基本不等式求最值的条件和方法.
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6 . 已知
,
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a861406a1c1f251aa4df7226c60ce125.png)
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7 . 如图,直角梯形ABCD中,
,
,
,在等腰直角三角形CDE中,
,则向量
在向量
上的投影向量的模为;若M,N分别为线段BC,CE上的动点,且
,则
的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852847ba02c2b62abf27e9cc11f596a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34bf00aeba15bce2cdee8ab487388dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a333d098fc1acefbdadfcac342fb8ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d1ae9fcd70ccbdda55f34e3371b64c0.png)
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8 . 已知正
的边长为
,中心为
,过
的动直线
与边
,
分别相交于点
、
,
,
,
.
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5dc34f1eb0f29b09e027a1f69479972.png)
______ ;
(2)
与
的面积之比的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc6bd78eaf4e6b4a904b9850392fcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323f0075c96990706da0ba1d81c91ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b18bf5477ab809cf5b133a045b0ea8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e07c611d39260a3160ef7380df0fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5dc34f1eb0f29b09e027a1f69479972.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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9 . 若
,
,且
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d272622f97191e9e586a55b0b982dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4356e8a7af30bd0fd0fe0a13404caffc.png)
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2024-06-08更新
|
399次组卷
|
2卷引用:天津市滨海新区大港油田实验中学2023-2024学年高二下学期第二次月考数学试卷
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10 . 已知
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c7a19e1029af85500bcff59d976b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb31fb16243b33e9d635b6341f0e37b.png)
A.![]() | B.0 | C.4 | D.8 |
您最近一年使用:0次
2024-06-08更新
|
749次组卷
|
2卷引用:天津市滨海新区大港油田实验中学2023-2024学年高二下学期第二次月考数学试卷