名校
1 . 平面直角坐标系中,
已是单位向量,向量
满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2354fdc2ca0aff39c3f1e7d50b1ea4.png)
对任意实数t成立,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56eda4bb8604c18d0016a4377d05435a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e14c924e83ae93263692baeb32f67c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2354fdc2ca0aff39c3f1e7d50b1ea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a01f42b80ac6c790abcdfafe3be5496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5455bdb43226a925e13da2df0f233be6.png)
您最近一年使用:0次
2020-05-11更新
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1359次组卷
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3卷引用:2019年全国高中数学联赛A卷