设
为单位向量,有下列3个命题:
①若
为平面内的某个向量,则
;
②若
与
平行,则
;
③若
与
平行且
,则
.
其中的假命题的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f389ec068eb1d1aa586b79097d70a7b.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd45133b4f2fdf0b46c3b571c6963335.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f389ec068eb1d1aa586b79097d70a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c026cd20447122fc96326bdb58d17783.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f389ec068eb1d1aa586b79097d70a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7958a6bddd1d578bbd6fbcb92e3f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956f1e9ac9951d4e02f2d7f9064a513a.png)
其中的假命题的序号是
更新时间:2023-03-15 00:13:02
|
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填空题-单空题
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(0.85)
名校
解题方法
【推荐1】已知
,
是与
方向相同的单位向量,若
在
上的投影向量为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403d20d0a39353a51d539b7c56a4b673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc64abe49847ade9b78678ba1f8e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b47561a24257b8a68216f57f2a548d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d33ee1f52775bf9ba66e0fdf0ecbb35.png)
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填空题-双空题
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解题方法
【推荐1】已知x,y是实数,向量
不共线,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa2fcefaf3d8868da0cb52877c5247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9045a763ffd30cd1f7abaef1f78b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
您最近一年使用:0次
填空题-单空题
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较易
(0.85)
名校
【推荐2】已知
,
,且
,则与
方向相同的单位向量的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d769ab21af5365d3c00dc617375ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076a44dc5e5fe677c26afd8530c2e200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
您最近一年使用:0次
填空题-单空题
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(0.85)
【推荐1】四边形
,
,
都是全等的菱形,
与
相交于点
,则下列关系中正确的序号是________ .
①
;②
;③
;④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45753003f8ba8bd5db1bcd69b40470a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd7ad519f7573be1c795182470b140b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad5c51c31a8abaefa5cd3991f2f8eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353f8f0249dcc5282db8c4c7f5470a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc3da4626ee54dfd1601efb654cd173.png)
您最近一年使用:0次
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【推荐2】如图,四边形ABCD和ABDE都是边长为1的菱形,已知下列说法:
![](https://img.xkw.com/dksih/QBM/2021/7/30/2775362247524352/2829796627922944/STEM/fe0c67c058ac44cc9735f45a5a67a1b0.png?resizew=133)
①
都是单位向量;
②
∥
∥![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc83becc28e0f43d71427d9e8775d4.png)
③与
相等的向量有3个;
④与
共线的向量有3个;
⑤与向量
大小相等、方向相反的向量为
.
其中正确的是____ .(填序号)
![](https://img.xkw.com/dksih/QBM/2021/7/30/2775362247524352/2829796627922944/STEM/fe0c67c058ac44cc9735f45a5a67a1b0.png?resizew=133)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02cadebef6b00f296d6848b22f73d1d.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82b252f90aec1d54af194b931205de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc83becc28e0f43d71427d9e8775d4.png)
③与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
④与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd0cecf5c102254b9755e42a80c3948.png)
⑤与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc83becc28e0f43d71427d9e8775d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9343a8b5576f8f6abafb7a31b4f5e081.png)
其中正确的是
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