已知
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338189ec20d1ec7fdbbc189d209428dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad487569ba96395b88e3e6e63587c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338189ec20d1ec7fdbbc189d209428dd.png)
A.0 | B.1 | C.2 | D.3 |
更新时间:2016-12-03 12:46:52
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单选题
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适中
(0.65)
名校
【推荐1】设
,则“
”是“
,
”的( )条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5c6c8a83373aa91df3592b98a274ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc44d6ae188c5fe524a3233ae1dd561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb13dd189d522c17177f7491dec495d3.png)
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A.充分不必要 | B.必要不充分 |
C.充要 | D.既不充分也不必要 |
您最近一年使用:0次
单选题
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适中
(0.65)
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【推荐2】已知函数
,函数
在区间
上恰有三个不同的零点
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40472e891ef00df5f98b9058789c9063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd1017814e9883c21b17e43703a7272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecbc125ff5059305a2577df5c76a1b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986c1f6564df09cb460ed695552a00c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca687af50841d3a108f918a5d3f7dc8.png)
A.-1 | B.![]() | C.1 | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
【推荐1】已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa940b0eee9e0c846a615eaf64c31ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076551e5518d24744cdbc90971eaec7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ee916980fba7194cc379725b5a6d41.png)
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A.(2,0) | B.(3,-1) |
C.(3,1) | D.(-1,3) |
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解题方法
【推荐2】在菱形ABCD中,
,点P在ABCD所在平面内,当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4892101126142bf05cb84a781489a8b9.png)
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您最近一年使用:0次
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【推荐1】如图
为互相垂直的两个单位向量,则
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/15a18943-1cdb-40de-b4d8-8fe1f7707914.png?resizew=178)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐2】已知
,
,
,则
与
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da032e305b3ad38754e2d52b8ca086bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743e28cf06b7b10f09a01c1bb6009e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef8f16f1ca4e00d69e74a30844744de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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适中
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解题方法
【推荐3】平面向量
与
的夹角为
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed13f678d9d69e61ec74d8dcedce3764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4247a5aa34b3e197b79719e8606b02f6.png)
A.![]() | B.![]() | C.4 | D.1 |
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