名校
解题方法
1 . 在平面直角坐标系xOy中,已知双曲线C:
(
,
)的左、右焦点分别为
、
,
是双曲线C上一点,且
.
(1)求双曲线C的方程;
(2)过点P作直线l与双曲线C的两条渐近线分别交于R、S两点.若点P恰为线段RS的中点,求直线l的方程;
(3)设斜率为-2的直线l与双曲线C交于A、B两点,点B关于坐标原点的对称点为D.若直线PA、PD的斜率均存在且分别为
、
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f13bf66fc845b115de4ec45b4be0e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd849d4c356a8d7d8263d78be15d1b88.png)
(1)求双曲线C的方程;
(2)过点P作直线l与双曲线C的两条渐近线分别交于R、S两点.若点P恰为线段RS的中点,求直线l的方程;
(3)设斜率为-2的直线l与双曲线C交于A、B两点,点B关于坐标原点的对称点为D.若直线PA、PD的斜率均存在且分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
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解题方法
2 . 已知数列
满足:①
;②当
时,
;③当
时,
,记数列
的前
项和为
.
(1)求
的值;
(2)若
,求
的最小值;
(3)求证:
的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9af4e10e79081d9d8f308f4469602a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e4e227352dd59fd2db5668eef89696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7428a907e1e376d64b44d693f2955f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0890b68f92a6f8c158aa50b37a97f700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5945ce5c2114af8c18718ca8dc899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26456abc978dd2173dedc6ffdf181fc0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d6b8f10142a7b23ee19cae223f378c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0f924858fdfc9403142fcbce46de32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526e30684a73181d5863bdacd62fbf0e.png)
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3 . 已知
为数列
的前
项和,数列
满足
,且
,
是定义在
上的奇函数,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d300cf45e1fb95e1df5f17106b30f469.png)
____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2815b24f5a89be7ae53aed93182e8988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc3575e96d9e3969411525624d7092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85562a6f6b3eeed84eed60281defe0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d300cf45e1fb95e1df5f17106b30f469.png)
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4 . 已知
,
是实数,1和
是函数
的两个极值点
(1)求
,
的值.
(2)设函数
的导函数
,求
的极值点.
(3)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4e59a6f4aa3c12b85d46b5cfda9e97.png)
其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2fbeb4a2d0422d46d7d1d6e9e4e707.png)
求函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fbc010a176e0a7ec721723b0dc06da.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86135bd40536042536c1c7bed21d0171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf7b0fa43423114258df836fc405d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86135bd40536042536c1c7bed21d0171.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4e59a6f4aa3c12b85d46b5cfda9e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2fbeb4a2d0422d46d7d1d6e9e4e707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67b3c1053018e095b0e8dfa94003f28.png)
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5 . 已知数列
的奇数项是首项为1的等差数列,偶数项是首项为2的等比数列.数列
前
项和为
,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c1afb2ab393153baf1dbb0b7457254.png)
(1)求
;
(2)求数列
的通项公式及数列
的前2k项和
;
(3)在数列
中,是否存在连续的三项
,按原来的顺序成等差数列?若存在,求出所有满足条件的正整数
的值;若不存在,说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c1afb2ab393153baf1dbb0b7457254.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec70234b2136c08abd7a59726cc0ea0.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1254067b56565394384de5be7b8f3ec1.png)
(3)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91239c38be30570f5905f56d03b0ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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6 . 已知动圆M经过点
、
,P是圆M与圆C:
的一个公共点.当
最大时,圆
的半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8128ddbc498393e3ea2475df1ab2f4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee045fcf052cb7562aeca2e86f6346f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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7 . 将正整数
分解为两个正整数
、
的积,即
,当
、
两数差的绝对值最小时,我们称其为最优分解.如
,其中
即为20的最优分解,当
、
是
的最优分解时,定义
,则数列
的前2024项的和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baf9e95e555b69df69a2bbc2ed86244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0337976ed56157fdfdb4ad0d5083f87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355bc0d6058a3dd1254ff395176ec55b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a46ca6d6012da9e32aacb4103129f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17236c6316d598e9804f5eab3cbef9f7.png)
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解题方法
8 . 设点
,
分别是椭圆
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3bfa958fe3c94a9ddd39ca9e042d58.png)
的左、右焦点,且椭圆C上的点到点
的距离的最小值为
点M,N是椭圆C上位于x轴上方的两点,且向量
与向量
平行.
(1)求椭圆C的方程;
(2)当
时,求点N的坐标;
(3)当
时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a30de57df4e6f60bffe9ac591b24fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710f1e8fee285e37772d9f58bd4b61fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3bfa958fe3c94a9ddd39ca9e042d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8387b687579c4d5152175c9d19e24232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059f06dc93193236ed1e46c7721160ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad87aebbc2bf0f175a426c6120b8f35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d013606162f3696de157db03d4ffdf.png)
(1)求椭圆C的方程;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cbb953e2550728529b3cd9e53514e8.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1628d7d23c6c674309a41dca789aa38a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e0aff4758593811029e5d4df15ffc4.png)
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解题方法
9 . 某景点的票价为5元,售票窗口只有2张5元并有足够多的门票.现有4人持一张5元,5人持一张10元来买票,则没有顾客需要等待找钱的概率为________ .(结果用最简分数表示)
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解题方法
10 . 如图,在正方体
中,
分别是线段
、BD上的点.给出下列两个说法:①存在点
,对任意点
,均有
;②若
,则直线
与
恒为异面直线,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.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/4d961cdda10c3f76c8f52ff1aa10aa45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7b64a0de3cbdfe5d348041d27e1179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
A.①、②都正确 | B.①、②都错误 | C.①正确,②错误 | D.①错误,②正确 |
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