对于平面向量
,
,
,下列叙述正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
A.若![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() ![]() |
更新时间:2022-03-19 12:24:53
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【推荐1】下列说法中正确的是( )
A.若![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.零向量与任何向量都共线 |
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【推荐2】给出下列命题:①在
中,
;②若A,B,C,D是不共线的四点,则
是四边形
为平行四边形的充要条件;③若
且
,则
;④若
,且
.其中正确的命题有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e184b35a597b0246bb6fd5d985267c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d553c04a8d0faefd23b016e73a4cba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a6579a0ba67d23494b584bf1e2cb13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf6efda6baa9b1240dcc6fd581ca126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e8cf36cabac8d78cb7eb92ec4c44fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0674386f0d1fcf53da104626f2da95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3854a1870df3dfab871bb1b15d41cb07.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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解题方法
【推荐1】在△ABC中,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d792a2aa25763e14cc2863be3887000.png)
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d792a2aa25763e14cc2863be3887000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a7d65562140e6cd1a0f4500ac0f574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】对于平面内
个起点相同的单位向量
,若每个向量与其相邻向量的夹角均为
,则
与
的位置关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf722077fcd08540550e13cbf57ed20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821786fe974c795b7869a895adfafed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d344174267f996c7cefecfd6985d380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be15993393fad482100b20ce63b3f32.png)
A.垂直 | B.反向平行 | C.同向平行 | D.无法确定 |
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【推荐1】如图,在等腰
中,已知
,
,E,F分别是边
,
上的点,且
,
,其中
,若线段
,
的中点分别为M,N,则
的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/9521122d-c0f3-41d3-871f-029d636cc1e5.png?resizew=196)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f322f8f148fbbaa38b6c0218ae68fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e9a5092afe1af9b0a2eb01c5f25a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa03dc81d855d51b5e5cb99bf31c50d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfe64604ee828d439929c94c205c51c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/9521122d-c0f3-41d3-871f-029d636cc1e5.png?resizew=196)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知在锐角
中,
,
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0217f4f170529ba47430fb31c4970b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/660d411077d7809d006fb3d534314ca1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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