2025高三·全国·专题练习
1 . 若实数
满足约束条件
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2a3bb3bd1bf87f61f17b7c22c6e282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c933f75333c29fe87468c5ab038edb79.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知甲、乙两个圆台上、下底面的半径均为
和
,母线长分别为
和
,则两个圆台的体积之比![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509322d1ac9bebd7cb434c17a7ee53ec.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9c70db11cd811fc2ff0fff93988b3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b252300558bc5528b39b0bd8bc9b8074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509322d1ac9bebd7cb434c17a7ee53ec.png)
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解题方法
3 . 已知倾斜角为
的直线
与椭圆
交于
两点,
为
中点,
为坐标原点,则直线
的斜率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4402aeb853b22f20992156957ef0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 已知向量
与
的夹角是
,且
,
,则向量
在向量
上的投影向量是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290710d643ab6cd3b9edd73815b1d8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0ae443a505d263c44a3d7515fd0170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34fa8ea29001bb1f0c1e5157aff2fca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
5 . 某工厂生产A、B、C三种不同型号的产品,产量之比为
现用按比例分配的分层随机抽样的方法抽取一个容量为n的样本,若样本中A种型号的产品有8件,则样本容量n的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71aa93fb9ac6c9706d599589ff47f0e6.png)
A.48 | B.36 | C.54 | D.42 |
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解题方法
6 . 已知向量
,
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993e9681181da32d59da5aa14daa853a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bafea1239cf295b70c767acba98d8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
7 .
中,
,
,
,则
的面积=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 如图,一个水平放置的平面图形
的斜二测直观图是平行四边形
,且
,
,
,则平面图形
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352529b508315e10a9a078898c2ae8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ab25321f41bc348d88ce366ce3c997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f67f17728f909cbaa4c6f2533c7888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61896e49d092197e53f8cfff4c1ddb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
A.16 | B.8 | C.4 | D.2 |
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9 . 已知一个水平放置的四边形ABCD,用斜二测画法画出它的直观图是一个底角为45º,上底长为1,下底长为2的等腰梯形
,则四边形ABCD的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
10 . 已知等差数列
,
,……,则该数列的前n项和
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb27896219fcacbcf9e01b99f92a893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa792c87a2ea4947e0a29b30a648cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.无最大值,有最小值 | B.有最大值,无最小值 |
C.有最大值,有最小值 | D.无最大值,无最小值 |
您最近一年使用:0次