9-10高二·四川巴中·期末
1 . 下列命题:
①函数
在区间
上是单调递增的;
②在
中,
, 当三角形ABC的面积为
时,
;
③若
为非零向量,且
,则满足条件的向量
有无数个;
④已知
,且
,
,则
.
其中正确命题的序号为____________ . (注:把你认为正确的序号都填上)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23050a18db5bb91c3491824998603b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f4acbe230001ea86b03440b25e8045.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89435b1523a275c6f9e9382acbfea44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a431c5068ba5c32af44906b40b33ce11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e592a54ea5e382967a04025dcd750bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ebb96c73c0abf240bdc3f9d1ecec7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab0f0e61713a059fc61832522acab1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772a8dc0935bae46b2bc322bb84d47d6.png)
其中正确命题的序号为
您最近一年使用:0次
2 . 在三棱锥
中,
,
,
,
,
分别为棱
的中点.现有以下3个结论:①三棱锥
的外接球表面积为
;②
;③
平面
.则其中正确结论的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c986d2a9857d425dc2c62b034dcfd34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4e66a2c8440276c9608a8abe834083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dee6c1410e79934b560642684807e70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc5f2856d1c952464453577bd1cc268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceeb10380ea1162ae9078c9b93adb846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a39dce3f1e36dbe01293c309816968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b0e8d6874ca0163575176a49accf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07d16fc91aa960b67ba4b474de8a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a270ec7e23fc0cc1d4b04bf1d22184.png)
您最近一年使用:0次
3 . 在三棱锥
中,
,
分别为棱
的中点.现有以下4个结论:
①三棱锥
的外接球表面积为
;
②
;
③
平面
;
④当
时,平面
平面
.
则其中正确结论的序号为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e561abd2bb54ac40d4f7af31ff9f7397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96c92bc20565fb976e0c73ee4017261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceeb10380ea1162ae9078c9b93adb846.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a39dce3f1e36dbe01293c309816968.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b0e8d6874ca0163575176a49accf45.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07d16fc91aa960b67ba4b474de8a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a270ec7e23fc0cc1d4b04bf1d22184.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3755b2bcf7516eedb26a27ad73657216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
则其中正确结论的序号为
您最近一年使用:0次