1 . 如图,在
中,设
,
,又
,
,向量
,
的夹角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/443f4f4d-0b1b-43d7-848d-aa7e5037cc1f.png?resizew=164)
(Ⅰ)用
表示
;
(Ⅱ)若点
是
边的中点,直线
交
于
点,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac265febbf99dccf51aa0a2253e61f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18663288c2245e1febaa003e3b58f56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c290cdc4cf3d6b82581e68ecaf5c7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a6325f466f657dde9cf7233a4fa638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/443f4f4d-0b1b-43d7-848d-aa7e5037cc1f.png?resizew=164)
(Ⅰ)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
(Ⅱ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9e71bc0b727b1440f83edb2783aff0.png)
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12-13高三上·江苏盐城·阶段练习
2 . 在△OAB中,已知P为线段AB上的一点,若
,
,
,且
与
的夹角为60°,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa534f31f5d56d3f0b4cc3a29c1d630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811e40a3bb22a4ac38e4ff8c78077cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612ced101f95eb7c9ea960cbff045dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eeb629a6f94d187154b9e0fba4eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987a2625dae99578e5c0e7b57d4a1c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ba7499bd7ef12d4be6a78d868d4800.png)
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名校
3 . 已知平行四边形ABCD的对角线相交于点O,点P在△COD的内部(不含边界).若
,则实数对(x,y)可以是( )
![](https://img.xkw.com/dksih/QBM/2017/12/12/1836926908350464/1837378648973312/STEM/8305e801ba7b490cbf1f867610b7e1e8.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7900019b3e64e60ec54c4c8f036181e.png)
![](https://img.xkw.com/dksih/QBM/2017/12/12/1836926908350464/1837378648973312/STEM/8305e801ba7b490cbf1f867610b7e1e8.png?resizew=169)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 在
中,
,
,D为AB边上的中点,则
等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68d5fab76be5d73f357190f9d37f94a.png)
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12-13高三上·山东济宁·阶段练习
解题方法
5 . 如图所示,
,若
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
__
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5799f23e5a9ec3c1cb238930bb4ee39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5880d857bd0cb6ea42d55ff3064c3c9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1570672295747584/1570672300965888/STEM/afd08f961109404589fc68a1a8c08125.png?resizew=250)
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6 . 已知
是
所在平面内一点,
为
的中点,若
,且
与
的面积相等,则实数
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/dacfabe8ab46e126be34ee862670daa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a698deee0d36c8d2772f39247f3f1b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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12-13高二上·四川·阶段练习
解题方法
7 . (1)证明直线和平面垂直的判定定理,即已知:如图1,
且
,
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
(2)请用直线和平面垂直的判定定理证明:如果一条直线垂直于两个平行平面中的一个,那么它也垂直于另一个平面,即
已知:如图2,
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cc1ed828a703622287cd28180d7986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260575a314a2dc229c718cd52a0e5c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60750b5eab6344496e925eb603cab46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfc54f2a9d7f4fa37f6d24fa9f79a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
(2)请用直线和平面垂直的判定定理证明:如果一条直线垂直于两个平行平面中的一个,那么它也垂直于另一个平面,即
已知:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acbf279dbafff1b748eef29e2661624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cc1ed828a703622287cd28180d7986.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679589920768/1570679595548672/STEM/37be3cc4-b809-48e4-9cb1-e200b42c90da.png?resizew=408)
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解题方法
8 . 在正方形
中,
是
的中点,且
,函数
,的图象为曲线
,若曲线
存在与直线
垂直的切线(
为自然对数的底数),则实数
的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcd4ad6a0ef1705c9b20aa7f9b0392b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55cdf23ae179803e7d7dde2dbb1b07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695fc90e2536e2c37115758dc79fe160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2019-01-30更新
|
72次组卷
|
2卷引用:2016届江西省吉安一中高三上学期第四次周考文科数学试卷
9 . 已知点
是
的中位线
上任意一点,且
//
,实数
满足
,设
,
,
,
的面积分别为( )
,记
,
,
,则
取最大值时,
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4219640b54235858910157aaa0bbd093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac779b70bd71ae3a77721efb04c62b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1f4daae2f62c08bb5d15947f675079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc6e602c10ba0b7322bf195f783b6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/912c5d6a7df8e35d4cbf14cace7bf035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ecc1e313aabe7bf812dc089aecb60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d17162f7eccd8be2110f57b5a25931a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909a4f858f645bfb056687e7c9ba4c76.png)
A.![]() | B.![]() | C.1 | D.2 |
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