1 . 已知圆锥的底面圆半径为
,侧面展开图是一个圆心角为
的扇形,则该圆锥的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知两个不相等的非零向量
,两组向量
和
均由二个
和三个
排列而成,记
,
表示S所有可能取值中的最小值,则下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9c91af174ebe66c921f52db385a6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80cf117684713abb259c5a8e5aa2eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6976da725a784a7d0f4fef50d1276205.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/0373b313a9dcb5835d05401085f6bc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494f173fed024b28d9e2bc7a96362d3d.png)
A.S有5个不同的值 |
B.若![]() ![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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3 . 已知函数
在
上单调递减,则实数
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e143cb5e7a030cc0c54ba4b5d17fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e497cf0f3da0412a1d18cad0f0a51e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知向量
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9ee9fa31f53c01db4ec94bbd6ddb12.png)
A.![]() | B.与向量![]() ![]() |
C.![]() | D.向量![]() ![]() ![]() |
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5 . 如图,点
分别是矩形
的边
上的两点,
,
.
、
分别为
、
的中点,求
;
(2)若
,求
的范围;
(3)若
,连接
交
的延长线于点
为
的中点,试探究线段
上是否存在一点
,使得
最大.若存在,求
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c066b8e15742b2ef57131636e54ca0f4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50651ac65f1837e81ce47b71c5f4eeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5604d3e156df3e7ccca0ccec9c9d45.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1697dd04381cd28fece406c739960b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604ed5bece96d5e878aa1c914acc2f9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e3d3a8bb04c4f34676aa6166eac112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
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6 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47dfdd0d44911067dd493f8b3e22df6.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d5c74d7422aa12622e516d6ecc25177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47dfdd0d44911067dd493f8b3e22df6.png)
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7 . 已知
,则
的最小正周期为______ ,
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e078bffc5aa18a9488e08280efe3d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a030d54b4b38ae441519431c534b81c.png)
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8 . 如图,在
的边上做匀速运动的点
,当
时分别从点
,
,
出发,各以定速度向点
前进,当
时分别到达点
.
,点
为三角形
的重心,试用向量
线性表示
(注:三角形的重心为三角形三边中线的公共点)
(2)若
的面积为
,求
的面积的最小值.
(3)试探求在运动过程中,
的重心如何变化?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](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/2ba399f21f2a4f9b94066ea578865a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba399f21f2a4f9b94066ea578865a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ba495e8f9fe02229a4248fdbfb4710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2caf2e65bebc1523f8e89b59a90f2ab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)试探求在运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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9 . 已知
和
是两个不共线的向量,
,
,且
与
是共线向量,则实数
的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a724b7e1ff94bc42112bd470fb4441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d5a9b6e288f1eebd65be8abe98b291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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10 . 与向量
平行的单位向量是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54aff3133ccdf7eb592e0084fdcdbac1.png)
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