在
中,若
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b771b6072744cec6c6b187c7290f2292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2f14f9c735d0a9c6673293684da59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2017-11-27 16:59:59
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相似题推荐
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名校
【推荐2】在△ABC中,有如下三个命题:①
;②若D为BC边中点,则
;③若
,则△ABC为等腰三角形.其中正确命题的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9795880ae08bd58a72fd6cb2c6cf2d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228d1bed9c6b582debcb52ffd0a40ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e6ac837ef3026a0c58ef8f6c578824.png)
A.①② | B.①③ | C.②③ | D.①②③ |
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解题方法
【推荐1】已知
中,点M是线段
的中点,N是线段
的中点,则向量
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350f162ee9aa08f4c9779481a5ef1025.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,
等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/5e3d3a56-7471-41ee-8dcb-85e176039bf4.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3143307ad0ba4a631eac04e814993655.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/5e3d3a56-7471-41ee-8dcb-85e176039bf4.png?resizew=183)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】若
是直线
上的一点,且
,则当
时,点
的位置( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369a88ed0850a2dfb0d8419d6704aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9dc4d2d967939c3f88cc8673870f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.在线段![]() | B.在线段![]() | C.在线段![]() | D.不能确定 |
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解题方法
【推荐2】已知直线
经过椭圆
的左焦点
,交
轴于点
,交椭圆C于点
,若
,则椭圆
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a69480dd19a3d40afc4229fff86337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf341c3e7fe4ade7e477db5fcaad37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】在
中,
,
,且CE与AD交于点P,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92afc8dd378edab7ec29a39cd102902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31bbf6eb192743f729241cb986306160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b029b3870524fe50018beba0c0bae4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】已知D,E为
所在平面内的点,且
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0f0becb969647c4056ab396c5d0c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2757a7d30edc1618c8756457229b91c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ce9ce863fc5d3025d581a61aaddfb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2236f581b11a0bb63addd062529acee8.png)
A.-3 | B.3 | C.![]() | D.![]() |
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【推荐3】
,
,
是圆
上不同的三点,线段
与线段
交于点
(点
与点
不重合),若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d53f6d504fbd7e84bd250d9cc819b9.png)
,则
的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/cfa92446-a2c4-4b40-9bf4-66384617afae.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d53f6d504fbd7e84bd250d9cc819b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd527971a35c293a9115d4c59f53362c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/cfa92446-a2c4-4b40-9bf4-66384617afae.png?resizew=141)
A.![]() | B.![]() |
C.![]() | D.![]() |
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