若
是任意平面向量,
,给出下列等式:
①
;②
;③
;④
;⑤
.
其中正确的等式个数是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68a83b4093280ea8750677f6828bf47.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94fae72e4cb9db4d642cc8846f5b8de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8192d66eaab5b9657114d65f1c3a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80cd8eb758f957af43f0b25315134be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b0b38c4c6475b1fe3e481cf5e60e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c15b319984e5d2bb4ef13149b63c3f.png)
其中正确的等式个数是( ).
A.2 | B.3 | C.4 | D.5 |
更新时间:2020-06-26 02:19:51
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