13-14高二下·湖南常德·期末
1 . 已知向量
,若
为实数,
∥
,则
=
![](https://img.xkw.com/dksih/QBM/2014/10/23/1571882084294656/1571882089791488/STEM/e8c44ee01f114e1a9b2d8ed039b91c48.png)
![](https://img.xkw.com/dksih/QBM/2014/10/23/1571882084294656/1571882089791488/STEM/009860b238924d708b112baf20f0dd7a.png)
![](https://img.xkw.com/dksih/QBM/2014/10/23/1571882084294656/1571882089791488/STEM/2c2c8d2cc90c4f69b24612c58d161a20.png)
![](https://img.xkw.com/dksih/QBM/2014/10/23/1571882084294656/1571882089791488/STEM/230234ef3dc74253aeae519d4898d8bd.png)
![](https://img.xkw.com/dksih/QBM/2014/10/23/1571882084294656/1571882089791488/STEM/009860b238924d708b112baf20f0dd7a.png)
A.![]() | B.![]() | C.1 | D.2 |
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2 . 在平面直角坐标系xOy中,设A、B、C是圆x2+y2=1上相异三点.若存在正实数λ,μ,使得
=λ
+μ
,则(λ﹣2)2+μ2的取值范围是
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572533166497792/1572533172387840/STEM/3ecdf43c0b1a411eb2262fb8cf15f80f.png)
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572533166497792/1572533172387840/STEM/bc04b057ddf5463fbf3dc5b1a5db73f0.png)
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572533166497792/1572533172387840/STEM/87c51ac830314696a2e8e17d78432dd2.png)
A.(![]() | B.(﹣∞,2) | C.(2,+∞) | D.(﹣∞,![]() |
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3 . 在
中,
为
的中点,设
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9bfa588948d8648cf484aefa38c038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4929a5dee3d2b8735dc00a799970fc78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9bfa588948d8648cf484aefa38c038.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2012·山东威海·一模
4 . 已知平面上不共线的四点O,A,B,C,若
则
的值为
![](https://img.xkw.com/dksih/QBM/2013/3/7/1571130788552704/1571130793918464/STEM/0e764905d11b4463aaa744d17fc61e10.png)
![](https://img.xkw.com/dksih/QBM/2013/3/7/1571130788552704/1571130793918464/STEM/d6504076ab9a458d92abfe1049eac77b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 如图,在平行六面体ABCD—A1B1C1D1中,已知
=a,
=b,
=c,则用向量a,b,c可表示向量
等于
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/2d7e01da959d42cbad41f181f0599797.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/7b1c08260ed84b16a16285f0a0c78753.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/57d35ada92d94e58aaf8df09fffd1c99.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/fb563434d1c0415c96ad498cb8b8269e.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/e51a693482e14f17ab3d8054ff326f15.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572957322633216/1572957328457728/STEM/2d7e01da959d42cbad41f181f0599797.png)
A.a+b+c | B.a-b+c | C.a+b-c | D.-a+b+c |
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6 . 在四面体
中,
,
,
,
为
的中点,则
=______________ (用
表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572608988938240/1572608994533376/STEM/6ea364dfbb6245f28c5172fc2e54add6.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572608988938240/1572608994533376/STEM/d5f33330e3b44d93a618cdebed5ccddf.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572608988938240/1572608994533376/STEM/dfaad32b76e945d99c2190774adc6a28.png?resizew=52)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572608988938240/1572608994533376/STEM/051e95d6b5de430695801f4c092abf93.png?resizew=17)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572608988938240/1572608994533376/STEM/ea1df3bcc1d04b22b5a725af2d8ab6e4.png?resizew=36)
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