解题方法
1 . “木桶效应”是一个有名的心理效应,是指木桶盛水量的多少,取决于构成木桶的最短木板的长度,而不取决于构成木桶的长木板的长度,常被用来寓意一个短处对于一个团队或者一个人的影响程度.某同学认为,如果将该木桶斜放,发挥长板的作用,在短板存在的情况下,也能盛较多的水.根据该同学的说法,若有一个如图①所示圆柱形木桶,其中一块木板有缺口,缺口最低处与桶口的距离为
,若按图②的方式盛水,木桶倾斜到与水平面成
时,水面刚好与左边缺口最低处
和右侧桶口
齐平,并形成一个椭圆水面,且
为椭圆的长轴,则该椭圆的离心率为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/cd6f2a5c-98d9-4e7a-98d4-2b69527fc316.png?resizew=259)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.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/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/cd6f2a5c-98d9-4e7a-98d4-2b69527fc316.png?resizew=259)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-02-14更新
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485次组卷
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4卷引用:四川省资阳市2022-2023学年高二下学期入学检测(上学期期末质量监测)理科数学试题
四川省资阳市2022-2023学年高二下学期入学检测(上学期期末质量监测)理科数学试题(已下线)专题20 椭圆-1四川省资阳市2022-2023学年高二上学期期末理科数学试题(已下线)模块一 专题4《圆锥曲线》单元检测篇 B 提升卷 期末终极研习室(高二人教A版)
2 . 给出下列四个命题:
(1)若
为假命题,则
均为假命题;
(2)命题“
”为真命题的一个充分不必要条件可以是
;
(3)已知函数
,则
;
(4)若函数
的定义域为
,则实数
的取值范围是
.
其中真命题的个数是
(1)若
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/7aef61e5e52646d09c07e7786b71fc28.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/43ab18badfe1443898d418fe742babd5.png)
(2)命题“
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/72b48a07ea5647eda7985b0e3a0872f9.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/ebb1c7812ab44ee3b6351d0b36004322.png)
(3)已知函数
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/d0f043ca221d4f7593b7f8a20d258155.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/369d0f62946745d09ed376839d64adc4.png)
(4)若函数
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/985c9af6f27c45e0acb6c6611379053a.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/be74c73ca843431d90d2585585cd6c76.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/c39f09eb37fa44cfac94ae27fa995575.png)
![](https://img.xkw.com/dksih/QBM/2016/10/25/1573093733056512/1573093738708992/STEM/40fbd1b2bdcf414b88fd094b92632257.png)
其中真命题的个数是
A.0 | B.1 | C.2 | D.3 |
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2019高二上·全国·专题练习
3 . 已知下列语句:
①有一个实数a,a不能取对数;
②所有不等式的解集A,都有
;
③有的向量方向不定;
④三角函数不都是周期函数吗?
其中,是特称命题的为______________ .(填序号)
①有一个实数a,a不能取对数;
②所有不等式的解集A,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd2491dc0189bacbcb09d74ee95e9b0.png)
③有的向量方向不定;
④三角函数不都是周期函数吗?
其中,是特称命题的为
您最近一年使用:0次
4 . 若
,且
,则有下列命题:①a,b全为0;②a,b不全为0;③a,b全不为0;④a,b至少有一个不为0.其中真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ff131c51a4ef6745538c18cec92c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
A.0 | B.1 | C.2 | D.3 |
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5 . 圆
的半径为定长
是圆
(点
与点
不重合)内或外的一个定点,
是圆上任意一点,线段
的垂直平分线
和直线
相交于
,当
值在圆上运动时,
的轨迹是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694032f6e765cbb0391c87c41ad629f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.椭圆 | B.双曲线 | C.椭圆或双曲线 | D.椭圆或双曲线的一支 |
您最近一年使用:0次
6 . 给出下列几个命题:
①命题
任意
,都有
,则
”:存在
,使得
.
②命题“若
且![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/1f8aee01d0a54edd92b491df11ba5cfc.png)
且
”的否命题为假命题.
③空间任意一点
和不共线的三点
、
、
,若
,则
、
、
、![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
四点共面.
④线性回归方程
对应的直线一定经过其样本数据点
、
、…,
中的一个.
其中不正确的个数为
①命题
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/e38866a16bba4113a5524226ea30c057.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/62e057f10d9a43eaa3683f1138571b57.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/88626f2fa51e4310abe08f1dccc080f8.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/baf3a1ec1a4841b7becebc67e9e43909.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/6df24cd16f6544da9453c2dec8bd3d9d.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3a2a588e364143ff8c222d4a8eb0a1a1.png)
②命题“若
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/12a28480ade84049bbdba88aa006d567.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/1f8aee01d0a54edd92b491df11ba5cfc.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/6a7dd34aebbc4c428235c04b0fee75d7.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/948a5172f32f4b609a1d71e169507527.png)
③空间任意一点
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/43dc44a2fd8148faa74fb656bb21bdac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/f13a75cf8fcc4c9c8368fcad505c0cac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/02f4868789d04ad3b0e8ef63259c44be.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7d02a82790eaa113fc0ba667e84038.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/d25acdd40c394b15b0e2c7f1ea50f741.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/f13a75cf8fcc4c9c8368fcad505c0cac.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/02f4868789d04ad3b0e8ef63259c44be.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/3e2a340c5ac342648b03b513a6c7e395.png)
四点共面.
④线性回归方程
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/8a9575f2d3de4ce4ad88d48b4529de67.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/b7ac535a88d645beb129b093b2b01c56.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/22d22ec86b8540c3b12c778a873c878e.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445101740032/STEM/4bfa31b001274f04bbddd63113bb5b0f.png)
其中不正确的个数为
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 下列四个命题:①一个命题的逆命题为真,则它的逆否命题一定为真;②命题“设
,若
,则
或
”是一个假命题;③“
”是“
”的充分不必要条件;④一个命题的否命题为真,则它的逆命题一定为真.其中不正确的命题是___________ .(写出所有不正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732a985eacdc6ba016d8a94d8fcf481f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de81985bd38d22c1ad3d1cbb920653f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdc78c604b10eba14ae694c84921076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be84cc9fe2ee7edaa012660fda622d26.png)
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2016-12-04更新
|
330次组卷
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5卷引用:2015-2016学年江苏泰兴中学高二上学期期末数学(文)试卷
2015-2016学年江苏泰兴中学高二上学期期末数学(文)试卷2017届河北武邑中学高三周考10.16数学(理)试卷内蒙古包头市铁路第一中学2016-2017学年高二下学期第二次月考数学(理)试题(已下线)2017-2018学年第一学期期末复习备考之精准复习模拟题高二江苏版数学试题(B卷)(已下线)专题03+常用逻辑用语(1)(命题,充分条件与必要条件)-2020-2021学年新教材高一数学秋季辅导讲义(沪教版2020)