1 . 对于非零向量
,
的模是
的模的2倍.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5338bc2d36b9290d5288b99e6ea6df2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fdffefb7563722eefbcebdac67f66f9.png)
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2 . 实数
与向量
的乘积还是向量.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
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3 . 若
,则λ=0或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57a47c35195783f2eba8c6fd6649594.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ebb215e473c34199bff42cc214cd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57a47c35195783f2eba8c6fd6649594.png)
您最近一年使用:0次