解题方法
1 . 已知
,给出下列四个命题:
:
,
:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92956b1693c71902b15e45118c1f87f.png)
:
,
:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac624f921a4282e16b160384c47414d0.png)
其中真命题的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9994c0aefa7220691dbcb9afa568a182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9309362eb34cd9d0d5757836f8d2fc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e686113ca2f873c4a911c8c636a39f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9309362eb34cd9d0d5757836f8d2fc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92956b1693c71902b15e45118c1f87f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0c5a96a4f87442cbfc05e59de281ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e3bf4d705125cab1f1868283ffc900f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee50575e3ebd56c4f46dd0bbf8e55d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0c5a96a4f87442cbfc05e59de281ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac624f921a4282e16b160384c47414d0.png)
其中真命题的是( ).
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
2 . 在
中,已知
,若
最长的边长为
,则最短的边长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c44ca2c5d2835f2555d31a77a8146fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 在数列
中,
,若数列
是以3为公比的等比数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636a4c1710469f090d45f77976d16a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175b4855b799d276f733969aa6b34d4b.png)
A.1006 | B.1007 | C.1008 | D.1009 |
您最近一年使用:0次
解题方法
4 . 已知函数
的图象关于直线
对称,
,且
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857275c21842f487ae5714a15f516cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8844df2680f4ffa17c8d6f3387f3a6a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567ead618b99282d247f6f369940e431.png)
A.240 | B.260 | C.![]() | D.320 |
您最近一年使用:0次
解题方法
5 . 已知a,b,c是的三边,若满足
,即
,
为直角三角形.类比此结论:若满足
时,
的形状为( ).
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.以上都有可能 |
您最近一年使用:0次
6 . 已知三棱锥的各顶点都在以O为球心的球面上,且
,
,
两两垂直,若
,则球心O到平面
的距离为( ).
A.![]() | B.![]() | C.1 | D.![]() |
您最近一年使用:0次
解题方法
7 . 已知三个正数a,b,c成等比数列,则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc98df461735c2d82a1d00bc7c9290a9.png)
A.1 | B.![]() | C.2 | D.![]() |
您最近一年使用:0次
解题方法
8 . 设函数
,且
,则当
时,
的导函数
的极小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd62d9969adba7f42d582ccab479cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96effbf356f5ad5594152169ad7ccc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
A.2 | B.3 | C.4 | D.5 |
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解题方法
9 . 若离散型随机变量X的分布列为
,则
的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6f972e03c2873e587cd63f56c14695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8e032ca369516e9a0fbbc177f21d0c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
10 . 设
,则“
”是“
”成立的( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd73ed7de4ec9894ee36332b592dc70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a730f248efcbff2abfd3229f00f355c.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次