解题方法
1 . 已知集合
,集合
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d19e56037bfbce12efc4cacfc2c9a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b0f89d67b67f58455fe082972bd56f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74e359b347e0f35b30983329acc367.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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解题方法
2 . 杨明上学有时坐公交车,有时骑自行车,他各记录了
次坐公交车和骑自行车所花的时间,经数据分析得到:坐公交车平均用时
,样本方差为
;骑自行车平均用时
,样本方差为
,假设坐公交车用时
单位:
和骑自行车用时
单位:
都服从正态分布,正态分布
中的参数
用样本均值估计,参数
用样本标准差估计,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf917622eff97b9220c33cb1f10241a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492b6d3883713fcaa8a4fdd87b87b480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19687c520f019ea28493d6503480a2d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05f867924efb6e1e4978ec63afedd46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c58d3ee17a903a3e43c877581e1ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af030075977058f849fcc30413483eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c58d3ee17a903a3e43c877581e1ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcc248a7770a16fa10fc4602d71e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
A.![]() |
B.![]() |
C.![]() |
D.若某天只有![]() |
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3 . 已知抛物线
的焦点为
,过点
且斜率为1的直线
与抛物线交于
两点.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5545195ade2bda359e683715332e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e5109b55b3b96af00c792527c77cca.png)
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4 . 盒中有
个红球,
个黑球,
个白球,今随机地从中取出一个,观察其颜色后放回,并加上同色球
个,再从盒中取出一球,则第二次取出的是黑球的概率是__________ .
![](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/5c02bc0c74292b1e8f395f90935d3174.png)
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5 . 在等比数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd7056daddcd57eb2204ef195eb6dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 如图所示,点P,Q分别位于边长为1的正方形
的边
上,
,记点
为
的外心,若
,则
的最大值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfbeb7390ee66d7b126812483a3152e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e13889db9188c455a3ac91f2f32cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e91eeb57e4fc87e26efb7d371f6f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/3e27b6a2-e055-4518-ab68-58ca764a7e9b.png?resizew=150)
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7 . 已知函数
.
(1)讨论
的单调性;
(2)若关于
的方程
有三个不同的实根,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b55dc7eecee4a28a3bef775562c9e8.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d64ef97b7ba8001ae416b5e8c3f42c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解题方法
8 . 如图,现有一食品厂的占地区域为半圆形,直径
为AB的中点,
为OB的中点,点
在BA的延长线上,且
,市政规划要求,在半圆弧上选取一点
,各修建一条地下管道EC和ED通往C,D两点.
(1)设
,试将管道总长(即EC+ED)表示为
的函数;
(2)若修建管道EC的费用为10万元
,修建管道ED的费用为20万元
,求修建管道的总费用的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a67684825f161c89e4225d3ede295d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531ca1e1d848fda5d98424d5f2d3c22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/47bcd8c4-264e-4b4d-8481-89279b61a090.png?resizew=162)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5550ae83ff211c28ff6e7a726a1c916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)若修建管道EC的费用为10万元
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98024ce2e23a5e81b2bcdd7c96ccef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98024ce2e23a5e81b2bcdd7c96ccef9.png)
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9 . 在
中,
是边AB的中点,
是线段CD的中点,则下列结论可能成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
10 . 已知函数
的部分图象如图所示.先将
图象上的每个点的横坐标变为原来的
(纵坐标不变),再将所得图象向右平移
个单位长度,向下平移1个单位长度,得到函数
的图象
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/6d1c6987-44d5-4454-b6bc-0ead5375f56e.png?resizew=167)
(1)求
的解析式;
(2)在
中,角A,B,C的对边分别为a,b,c,若
为锐角,且
,
的面积
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad933b514f83b046c17e9a8e8287de12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/6d1c6987-44d5-4454-b6bc-0ead5375f56e.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)在
![](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/388dc4f0807d77d28841fcf350fad8e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4e1b21f9f2f081e5329e53f6dc10a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2dd89c37b60b4596ac30e339aa0000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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