名校
1 . 给出下列四个说法,其中正确说法的序号为( )
①平行于同一直线的两平面平行;
②平行于同一平面的两平面平行;
③垂直于同一直线的两平面平行;
④垂直于同一平面的两平面平行
①平行于同一直线的两平面平行;
②平行于同一平面的两平面平行;
③垂直于同一直线的两平面平行;
④垂直于同一平面的两平面平行
A.①② | B.②③ | C.①②③ | D.②③④ |
您最近一年使用:0次
2020-01-14更新
|
512次组卷
|
2卷引用:河南省信阳市2018-2019学年高一上学期期末数学试题
名校
解题方法
2 . 已知平面
平面
,直线
平面
,直线
平面
,
,在下列说法中,
①若
,则
;②若
,则
;③若
,则
.
正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d983307d4345e724d9dd44935274843d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b02e0c74a66739bc83f73b5c5513cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b707f5ee4fbb2e637c65fbc6d8ed03.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb26a220ed44c446105df7caa0f1063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb26a220ed44c446105df7caa0f1063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
正确结论的序号为( )
A.①②③ | B.①② | C.①③ | D.②③ |
您最近一年使用:0次
2020-03-07更新
|
395次组卷
|
3卷引用:江苏省苏州市2018-2019学年高一下学期期末数学试题
3 . 在吸烟与患肺病这两个分类变量的计算中,下列说法正确的是( )
附:独立性检验的临界值表:
附:独立性检验的临界值表:
P(K2≥k0) | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
k0 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
A.若K2的观测值k=6.635,我们有99%的把握认为吸烟与患肺病有关系,那么在100个吸烟的人中必有99人患有肺病 |
B.从独立性检验可知有99%的把握认为吸烟与患肺病有关系时,我们说某人吸烟,那么他有99%的可能性患有肺病 |
C.从统计量中求出有95%的把握认为吸烟与患肺病有关系,是指有5%的可能性使得判断出现错误 |
D.以上三种说法都不正确 |
您最近一年使用:0次
2020-07-26更新
|
178次组卷
|
3卷引用:广东省珠海市2019-2020学年高二(下)期末数学试题
广东省珠海市2019-2020学年高二(下)期末数学试题(已下线)期末综合检测03-2020-2021学年高二数学下学期期末专项复习(苏教版选修2-2、2-3)陕西省咸阳市永寿县中学2022-2023学年高二下学期第一次月考文科数学试题
4 . 如图,点
是曲线
上的任意一点,
,
,射线
交曲线
于
点,
垂直于直线
,垂足为点
.则下列判断:①
为定值
;②
为定值5.其中正确的说法是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/60edb08e-5d5c-4687-8920-162fac037a19.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2049e67012cc849c6a55d40dbed50d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0af1a9647a129a692715564967a8ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378e03d75c73c8ca71f991a8c07729a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce21531a886c50568b75fd4278f15dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca909e0bfdc0a931b1969115e5c524a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb18ca54d4b25ddae3a613d91b20d551.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/60edb08e-5d5c-4687-8920-162fac037a19.png?resizew=199)
A.①②都正确 | B.①②都错误 |
C.①正确,②错误 | D.①都错误,②正确 |
您最近一年使用:0次
2020-07-14更新
|
602次组卷
|
5卷引用:上海市徐汇区2019-2020学年高二下学期期末数学试题
上海市徐汇区2019-2020学年高二下学期期末数学试题(已下线)专题5.4 期末考前必做30题(选择题提升版)-2020-2021学年高二数学下学期期末专项复习(沪教版)(已下线)3.3 抛物线-2021-2022学年高二数学同步精品课堂讲+例+测(苏教版2019选择性必修第一册)(已下线)3.3 抛物线沪教版(2020) 选修第一册 同步跟踪练习 期中测试卷
名校
5 . 已知两条不重合的直线
和
,两个不重合的平面
和
,下列四个说法:
①若
,
,
,则
;
②若
,
,则
;
③若
,
,
,
,则
;
④若
,
,
,
,则
.
其中所有正确的序号为( )
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb74d1dd9a5c29da15e6cdaae435af86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d2a947e3fdc214d40a7d3f54679a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b330d69a949d9b55f4b6f18f47e0a37.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d2a947e3fdc214d40a7d3f54679a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e076b91a9178217532e11c496400e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542a1572078188c8fbe82ebddf8af3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb74d1dd9a5c29da15e6cdaae435af86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73d51665f7e628b34b4cb5e637222e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5475e10ea3f37788e680395999037a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057cdb4057bca398a838e868efd360f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187f7895012551f2067f0b77d8df2141.png)
其中所有正确的序号为( )
A.②④ | B.③④ | C.④ | D.①③ |
您最近一年使用:0次
6 . 以下几种说法
①命题“
,函数
只有一个零点”为真命题
②命题“已知
,
,若
,则
或
”是真命题
③“
在
恒成立”等价于“对于
,有
”
④
的内角
,
,
的对边分别为
,
,
,则“
”是“
”的充要条件.
其中说法正确的序号为( )
①命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2c9043ff925c1fb693afd1516dbcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a12e04dcaf2cde31b57e86a3b41f471.png)
②命题“已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dad48527a47eab4a5916ab0421cc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34982de5d3f287cd570ea30eb46d185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be861d83cddb5fc8aa22f7f0f9415d6.png)
③“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e871c54f8021e1f0da4d552e38d8814f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53224898de85a85058ad336490bbbaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53224898de85a85058ad336490bbbaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02a486133c2f49aa028e8b13fb40b05.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048efda6ae51eb780e95ed3505b7be04.png)
其中说法正确的序号为( )
A.①③ | B.①④ | C.②③ | D.②④ |
您最近一年使用:0次
7 . 将4个相同的红球和4个相同的蓝球排成一排,从左到右每个球依次对应序号为1,2,…,8,若同颜色的球之间不加区分,则4个红球对应序号之和小于4个蓝球对应序号之和的排列方法种数为
A.31 | B.27 | C.54 | D.62 |
您最近一年使用:0次
2016-12-03更新
|
673次组卷
|
3卷引用:2014-2015学年江西南昌二中高二下学期期末理科数学试卷
8 . 给出下列命题:
(1)平行于同一直线的两个平面平行 (2)平行于同一平面的两个平面平行
(3)垂直于同一直线的两直线平行 (4)垂直于同一平面的两直线平行
其中正确命题的序号为( ).
(1)平行于同一直线的两个平面平行 (2)平行于同一平面的两个平面平行
(3)垂直于同一直线的两直线平行 (4)垂直于同一平面的两直线平行
其中正确命题的序号为( ).
A.(1)(2) | B.(3)(4) | C.(2)(4) | D.(1)(3) |
您最近一年使用:0次
名校
9 . 已知
、
是异面直线,给出下列结论:
①一定存在平面
,使直线
平面
,直线
平面
;
②一定存在平面
,使直线
平面
,直线
平面
;
③一定存在无数个平面
,使直线
与平面
交于一个定点,且直线
平面
.
则所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
①一定存在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe623bd25476a860fa4c2a179b81464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaf5492ffc6db02fd5968b643c8b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②一定存在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764b59b077bda19d131095b454942d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaf5492ffc6db02fd5968b643c8b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
③一定存在无数个平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaf5492ffc6db02fd5968b643c8b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
则所有正确结论的序号为( )
A.①② | B.② | C.②③ | D.③ |
您最近一年使用:0次
2020-03-21更新
|
448次组卷
|
3卷引用:【全国市级联考】北京市西城区2017-2018学年高一下学期期末考试数学试题
10 . 给出以下命题:
(1)若数列
存在极限,则该极限唯一;
(2)若直线
的倾斜角为
,则
的斜率存在且为
;
(3)设向量
与
的夹角为
,若
,则
为锐角;
(4)到
轴、
轴距离相等的点的轨迹方程为
.
其中所有正确命题的序号为
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(3)设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1e552a1451270703a86e592d7dd656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(4)到
![](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/54934d97f4087dfaf4302ea3914a9632.png)
其中所有正确命题的序号为
A.(1)(2) | B.(2)(3) | C.(1)(4) | D.(2)(4) |
您最近一年使用:0次