名校
1 . 如图,多面体
中,底面
为正方形,
平面
,且
,G为棱
的中点,H为棱
上的动点,有下列结论:
![](https://img.xkw.com/dksih/QBM/2023/3/4/3187265005854720/3189632691404800/STEM/812260ab23e3487898813c9999c89add.png?resizew=147)
①当H为
的中点时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
平面
;
②三棱锥
的体积为定值;
③三棱锥
的外接球的表面积为
.
其中正确的结论序号为______ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6db4765699190f823a4b79a898d9dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef319a6b6527b65dd91c98a590989a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2023/3/4/3187265005854720/3189632691404800/STEM/812260ab23e3487898813c9999c89add.png?resizew=147)
①当H为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93240c1473e10c736cc33b65053de761.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199098479c92e87304b91871172d46e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02dba908a505cff93e0b297d00b82a40.png)
其中正确的结论序号为
您最近一年使用:0次
名校
2 . 如图,多面体ABCDEF中,面ABCD为正方形,DE⊥平面ABCD,CF∥DE,且AB=DE=2,CF=1,G为棱BC的中点,H为棱DE上的动点,有下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/937a6588-9605-4bea-902b-55f620847fd2.png?resizew=175)
①当H为DE的中点时,GH∥平面ABE;
②存在点H,使得GH⊥AE;
③三棱锥B−GHF的体积为定值;
④三棱锥E−BCF的外接球的表面积为
.
其中正确的结论序号为________ .(填写所有正确结论的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/937a6588-9605-4bea-902b-55f620847fd2.png?resizew=175)
①当H为DE的中点时,GH∥平面ABE;
②存在点H,使得GH⊥AE;
③三棱锥B−GHF的体积为定值;
④三棱锥E−BCF的外接球的表面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705a1b850cb8031e4a90b143bb999d8b.png)
其中正确的结论序号为
您最近一年使用:0次
2022-04-08更新
|
2622次组卷
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9卷引用:东北三省三校2022届高三第二次联合模拟考试数学(理科)试题
东北三省三校2022届高三第二次联合模拟考试数学(理科)试题(已下线)查补易混易错点06 立体几何-【查漏补缺】2022年高考数学(理)三轮冲刺过关湖北省武汉市硚口区2022届高三下学期5月训练数学试题山西省山西大学附属中学校2022届高三三模(总第七次模块)理科数学试题湖南省长沙市长郡中学2023届高三上学期第三次月考数学试题湖南省怀化市湖天中学2022-2023学年高三上学期11月月考数学试题(已下线)第11练 空间直线、平面的平行-2022年【暑假分层作业】高一数学(人教A版2019必修第二册)辽宁省协作校2022-2023学年高二上学期期中考试数学试题辽宁省鞍山市岫岩满族自治县2022-2023学年高二上学期期中数学试题
解题方法
3 . 已知数列
的前n项和为
,
,若存在两项
,
,使得
,则下列结论正确的是___________ .(填写所有正确的序号)
①数列
为等差数列;
②数列
为等比数列;
③
为定值;
④设数列
的前n项和为
,
,则数列
为等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60965815aa04043db051b7bd89eda80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300e2a4fd67460b554c5a1b6250b463f.png)
①数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
②数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
④设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322a562f21a7104a2a1e238bc2ddbe79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5603dc343728b22e51232c29f3f3078b.png)
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2022-01-15更新
|
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4卷引用:贵州省贵阳市五校2022届高三11月联合考试数学(理)试题(三)
贵州省贵阳市五校2022届高三11月联合考试数学(理)试题(三)(已下线)2022年新高考北京数学高考真题变式题5-8题(已下线)2022年新高考北京数学高考真题变式题13-15题贵州安顺市2023届上学期高三期末数学(文)试题
名校
4 . 2014年7月18日15时,超强台风“威马逊”登陆海南省.据统计,本次台风造成全省直接经济损失119.52亿元.适逢暑假,小明调查住在自己小区的50户居民由于台风造成的经济损失,作出如下频率分布直方图.
![](https://img.xkw.com/dksih/QBM/2022/2/6/2910686787977216/2915618074992640/STEM/efc7263a-9d89-44fe-b7f5-3b9a525fb40c.png?resizew=264)
(1)根据频率分布直方图估计小区平均每户居民的平均损失;
(2)台风后区委会号召小区居民为台风重灾区捐款,小明调查的50居民捐款情况如下表,在表格空白处填写正确数字,并说明是否有
以上的把握认为捐款数额是否多于或少于500元和自身经济损失是否到4000元有关?
(3)台风造成了小区多户居民门窗损坏,若小区所有居民的门窗均由李师傅和张师傅两人进行维修,李师傅每天早上在7:00到8:00之间的任意时刻来到小区,张师傅每天早上在7:30到8:30分之间的任意时刻来到小区,求连续3天内,有2天李师傅比张师傅早到小区的概率.
附:临界值表
参考公式:
,
.
![](https://img.xkw.com/dksih/QBM/2022/2/6/2910686787977216/2915618074992640/STEM/efc7263a-9d89-44fe-b7f5-3b9a525fb40c.png?resizew=264)
(1)根据频率分布直方图估计小区平均每户居民的平均损失;
(2)台风后区委会号召小区居民为台风重灾区捐款,小明调查的50居民捐款情况如下表,在表格空白处填写正确数字,并说明是否有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f452908e724c9966128657203147834.png)
经济损失4000元以下 | 经济损失4000元以上 | 合计 | |
捐款超过500元 | 30 | ||
捐款低于500元 | 6 | ||
合计 |
附:临界值表
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 | |
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
您最近一年使用:0次
2022-02-13更新
|
1809次组卷
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4卷引用:辽宁省沈阳市第二十中学2021-2022学年高三上学期期末数学试题
辽宁省沈阳市第二十中学2021-2022学年高三上学期期末数学试题(已下线)第02讲 独立性检验-【帮课堂】2021-2022学年高二数学同步精品讲义(苏教版2019选择性必修第二册)(已下线)第08讲 成对数据的统计分析(核心考点讲与练)-2021-2022学年高二数学下学期考试满分全攻略(人教A版2019选修第二册+第三册)(已下线)高二数学下学期期末精选50题(压轴版)-2021-2022学年高二数学考试满分全攻略(人教A版2019选修第二册+第三册)
名校
5 . 如图,矩形
中,
,
为边
的中点,将
沿直线
翻折至
的位置.若
为线段
的中点,在
翻折过程中(
平面
),给出以下结论:
①三棱锥
体积最大值为
;
②直线
平面
;
③直线
与
所成角为定值;
④存在
,使
.
则其中正确结论的序号为_________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8588e18e27bfebf7c81c7e3c7efb1149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb79f948d408ab4fb6708bde172c5e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b9f96b8ecc3cb000bb2f030809f225.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c70966a318ef8ecf874257f5c5e5db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
④存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2181c78134c310f746eab44b9124e63b.png)
则其中正确结论的序号为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/db8c3c80-3639-479e-8ae4-e7aeaef6394b.png?resizew=239)
您最近一年使用:0次
2022-07-01更新
|
1382次组卷
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5卷引用:北京市海淀区2023届高三一模数学试题查漏补缺练习
6 . 已知函数
的定义域为
,其导函数为
,且满足
,
,若
,且
.给出以下不等式:
①
;
②
;
③
;
④
.
其中正确的有___________ .(填写所有正确的不等式的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9eca1510647f9b40cf7ce69c3757f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d3e854c20afcc64563d73509d7fec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf81a4a39b4e2df4d05dc3b2fcc28150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d900314efb0e4cacb6e5de945b5397.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9dfcf14375629c84b688a2676dcba1.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4240b3f95b81bb26488fedff54637634.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fa3106f981611b33e2872f5967ffec.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceccfc629ea5bb0d51036eb22fd2ec14.png)
其中正确的有
您最近一年使用:0次
2021-04-04更新
|
904次组卷
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4卷引用:天一大联考2020-2021学年高中毕业班阶段测试五理科数学试题
7 . 已知函数
若方程
有且只有五个根,分别为
,
,
,
,
(设
),则下列命题正确的是_____________ (填写所有正确命题的序号).
①
;②存在k使得
,
,
,
,
成等差数列;
③当
时,
;④当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a696b23bf6556ef55eeeff5379080ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48dc6d0827a159050e3fa55164f258b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4acd5e05f89802149b8b810c24d6ac73.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59d678b4c4aa0ec2bb04be1b2739a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a4eaa80b44625890339d6a0065c241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779bc714193033c738599c30487bd42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c12f6211f669ab04f4fe1c1b279ac2e.png)
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8 . 设
为多面体
的一个顶点,定义多面体
在点
处的离散曲率为
,其中
(
,
)为多面体
的所有与点
相邻的顶点,且平面
,平面
,
,平面
和平面
遍历多面体
的所有以
为公共点的面.
(Ⅰ)任取正四面体的一个顶点,该点处的离散曲率为______ ;
(Ⅱ)如图所示,已知长方体
,
,
,点
为底面
内的一个动点,则四棱锥
在点
处的离散曲率的最小值为______ ;
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189553408671744/2190033901625344/STEM/d702c3f66ea94eca9f04400c83427802.png?resizew=265)
(Ⅲ)图中为对某个女孩面部识别过程中的三角剖分结果,所谓三角剖分,就是先在面部取若干采样点,后用短小的直线段连接相邻三个采样点形成三角形网格.区域
和区域
中点的离散曲率的平均值更大的_______ .(填写“区域
”或“区域
”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fe17927b79a9ab83ed1a35b904bd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc903da7487dcd2f069b50a5cf2bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940cd957b9db25326a0c7a413df7f1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835c74bbb8c61dd2d2f008664a8c8810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183f3fdb3204864ff2f60c8c1dac2f2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db59863ffec5fa450ab8342fd8675c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d7f18c3c9dae7e6d4f2e96281289f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f733e19f18ab01a3c022331805ed58a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(Ⅰ)任取正四面体的一个顶点,该点处的离散曲率为
(Ⅱ)如图所示,已知长方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0424446817f60c18f8e4e3cc202ad99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3a9df7d8e2ad07128d69fb50962a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189553408671744/2190033901625344/STEM/d702c3f66ea94eca9f04400c83427802.png?resizew=265)
(Ⅲ)图中为对某个女孩面部识别过程中的三角剖分结果,所谓三角剖分,就是先在面部取若干采样点,后用短小的直线段连接相邻三个采样点形成三角形网格.区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189553408671744/2190033901625344/STEM/5e7f249d436a4d5eb004497f932097c3.png?resizew=153)
您最近一年使用:0次
解题方法
9 . 在四面体
中,
分别是
的中点.则下述结论:
①四面体
的体积为
;
②异面直线
所成角的正弦值为
;
③四面体
外接球的表面积为
;
④若用一个与直线
垂直,且与四面体的每个面都相交的平面
去截该四面体,由此得到一个多边形截面,则该多边形截面面积最大值为
.
其中正确的有_____ .(填写所有正确结论的编号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb5153d0153f8bc487c77fee73acfa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
①四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
②异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfe975874e9c8ac38a8c0e3354e1024.png)
③四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df974afaeb5e77fe9f94354aee551cf.png)
④若用一个与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
其中正确的有
您最近一年使用:0次
名校
10 . 已知
中,角
、
、
所对的边分别是
、
、
且
,
,有以下四个命题:
①
的面积的最大值为40;
②满足条件的
不可能是直角三角形;
③当
时,
的周长为15;
④当
时,若
为
的内心,则
的面积为
.
其中正确命题有__________ (填写出所有正确命题的番号).
![](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/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df6bb52902ef2cb7ba7ef1a681cdb1a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
②满足条件的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b9446d7b31f0d6e044cf99deeb20aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b9446d7b31f0d6e044cf99deeb20aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
其中正确命题有
您最近一年使用:0次
2018-03-29更新
|
1328次组卷
|
4卷引用:四川省德阳市2018届高三二诊考试理科数学试题