1 . 已知
中,角A,B,C所对的边分别为a,b,c,若
,且
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d80c53a03fa03cd3212cc4ac70be1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 已知向量
,
,若
,
的夹角为钝角,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303e0f7b92a9fb0bca726e1de9d9df98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d830f1864615e29ce030b533bed3834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
3 . 如图,在正方体
中,作截面
如图
交
,
,
,
分别于
,
,
,
,则四边形
的形状为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431ac3ebec6e84a93225946e80ad3e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
A.平行四边形 | B.菱形 | C.矩形 | D.梯形 |
您最近一年使用:0次
4 . 已知圆锥的侧面积为
,它的侧面展开图是圆心角为
的扇形,则此圆锥的高为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf1f865bafd4a820406d336d99f8091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 如图,设Ox,Oy是平面内相交成
角的两条数轴,
,
分别是与x轴,y轴正方向同向的单位向量,若向量
,则把有序数对(x,y)叫做向量
在坐标系
中的坐标.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](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/e5253a9a71037d60059b60237824193b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91174b2336306191ba275a87864172b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e95756bac72900388225b888dd9369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabb2467edcbd35d3d0748e441d9d008.png)
A.![]() | B.2 | C.![]() | D.4 |
您最近一年使用:0次
解题方法
6 . 同时抛掷两枚质地均匀的骰子,观察向上的点数,设事件
“第一枚向上点数为奇数”,事件
“第二枚向上点数为偶数”,事件
“两枚骰子向上点数之和为8”,事件
“两枚骰子向上点数之积为奇数”,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
A.![]() | B.A与C相互独立 | C.B与D互斥 | D.B与D相互独立 |
您最近一年使用:0次
7 . 已知数据
的平均数为10,方差为5,数据
的平均数为
,方差为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ef7e4d476f582e5c48c40bfb95d59f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10be67b56c6c8299d1433c473df384b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
8 . 如图,四棱锥
中,
面
,四边形
为正方形,
,
与平面
所成角的大小为
,且
,则四棱锥
的外接球表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5b87e9c2668babc037844dd615cb7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
A.26π | B.28π |
C.34π | D.14π |
您最近一年使用:0次
9 . 已知m,n为两条不同的直线,α,β为两个不同的平面,则下列结论中正确的是( )
A.若![]() ![]() ![]() |
B.若m⊥α,n⊥α,则![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若α⊥β,![]() |
您最近一年使用:0次
10 . 已知
,
,若
,则实数
的值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db10355e559fda75bd2f8f47278ec8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c8e6f7d2099684b9e4da51907e424f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33608c167be83dd4e9b2447885ed85cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.3 | C.2 | D.![]() |
您最近一年使用:0次