解题方法
1 . 在
中,内角
,
,
所对的边分别为
,
,
,若
,
,
的面积为
,
.
(1)求
的值;
(2)求
的值;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46196aec06c25d5c8f9b1d3a8f50a889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbf6058af569d42ac8278fbb8eefa51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aae1dc870a60a2070469d556deb472.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbd024dea26080f16e51fc6ab4b416d.png)
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解题方法
2 . 已知
,
,
,且
.
(1)求实数
的值;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3b455c65bcc201437e851632dc19e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489340c9a2d70c00bae13b7018cad448.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd0427a39adbc1f3d6435c8491d92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
3 . 已知随机变量
,且正态密度函数在
上单调递增,在
上单调递减,
.
(1)求参数
,
的值;
(2)求
.(结果精确到0.0001)
附:若
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c37d5ccf85fdfdc0a381cb7b8a46b44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a039b92f94ca78bc834b537c4007cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d420e36c06ae07366dbe7cfdbb2b8067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb3d3af440421b2e23c3fe3d089c1cc.png)
(1)求参数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b9ab0cc7509667fcfd76b75765cc55.png)
附:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c37d5ccf85fdfdc0a381cb7b8a46b44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a023b517ef4318fb26924620640feb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c2b08e9edf6dc4404cb701d8277cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9588c2d556435869ccfb95a4fe0f17.png)
您最近一年使用:0次
解题方法
4 . 某校课外学习社对“学生性别和喜欢网络游戏是否有关”作了一次调查,其中被调查的男、女生人数相同,男生中有
的学生喜欢网络游戏,女生中有
的学生喜欢网络游戏,若有超过
的把握但没有
的把握认为是否喜欢网络游戏和性别有关,则被调查的学生中男生可能有_____________ 人.
附:
,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90198de4171921876c6a76f880377f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363cc53497fdfac77b43f656424f973.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0027bac3e5bdeaccf6429e9835cb0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.05 | 0.01 | |
3.841 | 6.635 |
您最近一年使用:0次
5 . 已知函数
的图象过原点,且曲线
在原点处的切线为第二、四象限的平分线,试写出一个满足条件的函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba99a5c5661eedaef4b36ade1a7c5c5.png)
您最近一年使用:0次
6 . 设
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee07d019346f09d45f08f61c153b858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce51f90428d59edb5e8ab31f0a12862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7826f195ae3e24d3fa2d5043d30db41.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 计算器计算
,
,
,
等函数的函数值,是通过写入“泰勒展开式”程序的芯片完成的. “泰勒展开式”的内容为:如果函数
在含有
的某个开区间
内可以进行多次求导数运算,则当
时,有
,其中
是
的导数,
是
的导数,
是
的导数,…. 取
,则
精确到
的近似值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad040ae0fab73f5dd7b1af48cd3b5f93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a284a589e0050df11c598d201282c3ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc8c56d09485b718a85ed23f637e2d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483d7559ab4408d8f7fa63e14313a818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f263b44213ddcbbedf1fcacb84e249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a981463ef42f0aaf5a1bb266d7cfe52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10acd6d864583617dd3e71240bf0c857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0b72923071c1010a36f17cb3d1168b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10acd6d864583617dd3e71240bf0c857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909736dad505d81be43aef91e6309bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1ab906a1a75aad7463378470ec5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
A.0.82 | B.0.84 | C.0.86 | D.0.88 |
您最近一年使用:0次
8 . 某企业生产线上生产的产品的某项指标
,且
. 现从该生产线上随机抽取
个产品,记
表示
的产品个数,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8510516717c585a903044c9e526c0cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578f3a36b256b533814e6854fe3bf86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b43ab8f178eb7e3686a5e52dc9a1799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c0f363e40a7bcb1a705f74bf08e871.png)
A.7 | B.9 | C.11 | D.13 |
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9 . 已知变量
关于
的回归方程为
,其一组数据如下表所示. 若
,则预测
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6142e34704e18f36b4e7192caa17ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224d30ca84f1aeeeda7a718e751a4925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
2 | 3 | 4 | 5 | 6 | |
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 有一组数据如下表所示,则下列函数模型中,最适合模拟这组数据变化规律的是( )
1 | 2 | 3 | 4 | 5 | |
3 | 5 | 6.9 | 9.1 | 11 |
A.一次函数 | B.二次函数 | C.指数函数 | D.正切函数 |
您最近一年使用:0次