已知D,E,F分别为
的边BC,CA,AB的中点,
,
.给出下列五个命题:①
;②
;③
;④
;⑤
.其中正确的命题是________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c748c4c6d9c1e5c16a8ed47f0792f5ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325ba8093bd40f00a79e3c49010ea704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fabf836a5eb2105f5a32160b75640c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02eebf7a1735f79410972024a240d5ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90af074d599eb5e01bd70c006eba18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86be0095b9368de7e7f98d295b2e30d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e9797890bf26b0ac59fc8bf2f78ab.png)
20-21高一·全国·课后作业 查看更多[4]
(已下线)9.2.2 向量的数乘(已下线)第03讲 向量的数乘-【帮课堂】2021-2022学年高一数学同步精品讲义(苏教版2019必修第二册)苏教版(2019)必修第二册课本习题 习题9.2(2)(已下线)专题03 向量的数乘运算(2)-《重难点题型·高分突破》
更新时间:2021-11-12 12:40:48
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填空题-单空题
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较易
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【推荐2】给出下列命题:①若
,
同向,则有
;②若
,
不共线,则有
;③
恒成立;④对任意两个向量
、
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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【推荐1】已知
,
是不共线的平面向量,
,
,
,若
,
,
三点共线,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff409cd3886c767afb13c9a869c5f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6570cd7c2f81c9fcffd2c64664f1564.png)
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【推荐2】在
中,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7590a22611f3935d8e32eac956c2a4c1.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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【推荐1】已知
,
,
,则
在
方向上的投影向量是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c22fc9f7e478d49b9abfc4bd813902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b113dc271cf51b3018bd1de14edf73ad.png)
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【推荐2】已知O为
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___________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708dca69fe58a9c3a535401181257b0b.png)
___________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0976b61141fb7c70efeea95c19ea35b.png)
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【推荐1】古代典籍《周易》中的“八卦”思想对我国的建筑有一定影响.图1是受“八卦”启示设计的正八边形的八角窗.在正八边形
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______ .
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