1 . 已知空间四边形
的对角线
cm,
cm,
、
分别是
、
的中点.若异面直线
、
所成的角为
,则
的长等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2018-12-27更新
|
184次组卷
|
2卷引用:第三届高二试题(决赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)
2 . 把直线
上的点
按向量
平移后,得直线
上的点
,有
,
.则
的值( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63cfa276d4315c5b77cbe010a06854b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e212cdbfba6610bc55df2c1a737407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55c8cdd1dcb11a5d4602489e7128717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6baa80a792516b83ac50fc6f46a737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b587f360c1a3ce5345d5b8f3145fbdfc.png)
A.等于1 | B.等于2 |
C.等于3 | D.不能确定,与![]() ![]() |
您最近一年使用:0次
2018-12-27更新
|
201次组卷
|
2卷引用:第三届高二试题(初赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)
3 . 设椭圆
的一个焦点为
,点
在
轴上,直线
交椭圆于点
、
、
则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf75b789b38dd54c0d4624ee6eeb12c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0e2297e289632ffc211bd20e2e772e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.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/7de1c39ed052bc602480114d5b5cac92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf75b789b38dd54c0d4624ee6eeb12c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2018-12-27更新
|
230次组卷
|
3卷引用:第三届高二试题(初赛)-“枫叶新希望杯”全国数学大赛真题解析(高中版)
4 . 小王在word文档中设计好一张A4规格的表格,根据要求,这种规格的表格需要设计1000张,小王欲使用“复制—粘贴”(用鼠标选中表格,右键点击“复制”,然后在本word文档中“粘贴”)的办法满足要求.请问:小王需要使用“复制—粘贴”的次数至少为( )
A.9次 | B.10次 | C.11次 | D.12次 |
您最近一年使用:0次
5 . 已知一双曲线的两条渐近线方程为
和
,则它的离心率是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b386e2c5d9ad7cec404ce5c40dbebe42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc261508f42e75323971f0b8282b0ab.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 已知等差数列
及
.设An=a1+a2+
+an,Bn=b1+b2+
+bn,若对
,有
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b468786c8644db94f4aa5b781478f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2448cf72af76b810310e4cfb9818e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daca83a7d5dd024f1b7338df1377bf48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a67649ce7b7b3f072c6810fb0108065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b468786c8644db94f4aa5b781478f3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
7 . 设
是单位圆
的一条弦.若
的面积恰好等于以
为边的正方形的面积,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
______ (精确到0.001度).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
您最近一年使用:0次
8 . 计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafac2d6cfa1c159ab800974f9b323ad.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafac2d6cfa1c159ab800974f9b323ad.png)
您最近一年使用:0次
9 . 不等式组
的解是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b04b5cc1674bdc2b2d063d4cbf3953.png)
您最近一年使用:0次
10 . 用平行于底面的平面截棱锥,截面积与底面积之比为1:3,则该截面把一条侧棱分成上、下两段长的比是__________ .
您最近一年使用:0次