下列说法正确的有( )
A.已知![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
22-23高一下·陕西西安·期中 查看更多[3]
更新时间:2023-08-17 12:21:44
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【推荐1】给出下列四个命题:①若
,则
;②若
,则
或
;③若
,则
;④若
,
,则
.其中正确的命题有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aee5552460cc2bcfdbbe856ef721976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e41c1a24a6a4e28d1c53d2d2f616cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101c064c0613bf38657ee27baaf4c924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf622559035c0764b67644604514c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7b54325f484648850d3e9f8cb3209d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a683d9cd5f84e07bc351819d9dd96df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101c064c0613bf38657ee27baaf4c924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a683d9cd5f84e07bc351819d9dd96df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de7352b1f20f15d9cac0c85f2042e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354a4a1a0bcd3f3e6bcbc07407e365c5.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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【推荐2】下列命题:
①两个相等向量,若它们的起点相同,则终点也相同;
②若
,则
;
③若
,则四边形ABCD是平行四边形;
④若
,
,则
;
⑤若
,
,
;
⑥有向线段就是向量,向量就是有向线段;
⑦任何一个非零向量都可以平行移动.
其中,假命题的个数是( )
①两个相等向量,若它们的起点相同,则终点也相同;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab14f1db85f43583c37c416c1bcacd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b7ca4667865ebe617fa6539e8d11fd.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b700238846f562c297b054cb7dd2077a.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ad164c5800f0c2e10a6e3a3f508058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daee83ea4da6bed69865d1c140e5f3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e421cf0ec7e21003eef976b20751d4.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460e5ba67828c57daf2edb497fb52e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b851cdd98d9bfccefe30f1a6eef360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c15b85c1d8d1b30099d9aeb73eb184.png)
⑥有向线段就是向量,向量就是有向线段;
⑦任何一个非零向量都可以平行移动.
其中,假命题的个数是( )
A.2 | B.3 | C.4 | D.5 |
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【推荐1】设
,
,向量
,
,
,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f370a1d4dd341e5ab1774a66c66c1204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e116c735d5945248043307eac8d45ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680b6004a6f0e5c9bb91e85a27cbe2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a2728d518fe364cf48852ad32b87b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1c5bcaa260128e281a12f6ef6aacbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ddc0023301ada62ceafa81b4a89a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
A.0 | B.1 | C.2 | D.3 |
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【推荐2】已知抛物线
的焦点为
,直线
不过点
且与
交于
,
两点(点
在
轴上方),与
轴负半轴交于点
,若
,
,则直线
的斜率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1ba86ffc6e5542b62319848c14acaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda431c3bcdf4a76266dee40d764816d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f8f333303816ff66e3aa44bcf97268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐1】已知向量
,则向量
与
夹角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd284048dfcf93f7f3503c58cd1d33b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】已知向量
,
,若
,
的夹角为钝角,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303e0f7b92a9fb0bca726e1de9d9df98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d830f1864615e29ce030b533bed3834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次