1 . 如图,在空间直角坐标系
中,正方体
的棱长为1,且
于点E,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a20b689283cc8b311eddae4c8c4242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77bb3ceea90414c8561c000e724f2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398c5d7b6ff455e94a78034670a3eeca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/fe8be1e3-2774-4a29-807f-bb610ae8e4d9.png?resizew=145)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2 . 已知
中,
,
,
,以B、C为焦点的双曲线
经过点A,且与
边交于点D,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652fdeb35240a9c641c5b85367aa5074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177ae60ade0b7ac20e7bdc40eaa1ef5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d009fae4c2f0f8f4a0a31e69e0a950.png)
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解题方法
3 . 已知双曲线
的渐近线方程是
,实轴长为2.
(1)求双曲线
的方程;
(2)若直线
与双曲线
交于
两点,线段
的中点为
,求直线
的斜率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bf4fd84818abac17a9d21237ac5ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10273b05ad8210d8db07639c4d149fd.png)
(1)求双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d12ed430d52fc0ba03785273eda3d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
4 . 已知等差数列
的前3项和是24,前5项和是30.
(1)求这个等差数列的通项公式;
(2)若
是
的前n项和,则
是否存在最大值?若存在,求
的最大值及取得最大值时n的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(1)求这个等差数列的通项公式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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5 . 如图,在四面体
中,
,
,
,点M、 N分别在线段
、
上,且
,
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2024/1/31/3422845647241216/3433855973654528/STEM/3342a6ecdbb843b286e0fd52fd346169.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14390e9b6b44472bdc7a131133ab39b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07dcf0b16163e0e0e0c0f248466ee7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed047057b4761eb26c763f563e39667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db954ae54ae36c4de591ba32c2408002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.png)
![](https://img.xkw.com/dksih/QBM/2024/1/31/3422845647241216/3433855973654528/STEM/3342a6ecdbb843b286e0fd52fd346169.png?resizew=141)
A.![]() | B.![]() |
C.![]() | D.![]() |
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6 . 等比数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c3aed8080f03c6fbd5da85238278ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa3a7ce62e7bf557d9e1bf77c8dac0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
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解题方法
7 . 已知双曲线
与直线
相交于M、N两点,且M、N两点的纵坐标之积为
,则该双曲线的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0e308d06579ae683524a6c04d9872c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eaeeef60273e0fbec9b47d608059f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
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8 . 若方程
所表示的曲线为C,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4f68ba4de0c96ff5b78a09f6ae67d6.png)
A.曲线C可能是圆 |
B.若![]() |
C.若C为椭圆,且焦点在x轴上,则![]() |
D.若C为双曲线,且焦点在y轴上,则![]() |
您最近一年使用:0次
9 . 已知等比数列
的前n项和为
,且
.
(1)求数列
的通项公式;
(2)若
,令
,求数列
的前n项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b351196ad42544f3f427f823c2146e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64734957a53307185890ebb40717af48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac07953530e3c248b3438fb200fb1661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eee81e090b96819b7df54fc1bcc3a6.png)
您最近一年使用:0次
10 . 如图,已知点A(6,4),AB⊥x轴于点B,E点是线段OA上任意一点,EC⊥AB于点C,ED⊥x轴于点D,OC与ED相交于点F,求点F的轨迹方程.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/84cfde0e-f97c-4505-8e4b-af6602e5a0ad.png?resizew=179)
您最近一年使用:0次