1 . 设函数
(
,
),
.
(Ⅰ)当
时,求曲线
在点
处的切线方程
,并证明
(
)恒成立;
(Ⅱ)当
时,若
对于任意
恒成立,求
的取值范围;
(Ⅲ)求证:
(
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37f200f49eac20206f706571853b442a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd1b5c820f64b9c3033d2a34ee6a925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f8e40c2ffde956967d909ba8a09d04.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657435e1fda84118e7f63c97505c8b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2072fe5a3f23ac574dde4f0abb2fd5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3d641761af730cc20b05a79fad66f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4204025f952518d9f80820fe4906522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec9ff3d82ba1c5f4bf4d217371ddee8.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bd3a63b4be53a6e3538b7846e45662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c95d0a9384e55103eae330396de544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f408648547408fab1ec0e703a989baaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅲ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64199b0969151a5cd0616ac4de8bec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7035ce63c77b441f544fed0b4975d3bb.png)
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2 . 选修4-1:几何证明选讲
如图,直线
与直径为4的圆
交于
两点,且
,直线
切圆
于点
.
![](https://img.xkw.com/dksih/QBM/2016/7/27/1572944464273408/1572944470859776/STEM/dbd9a8da005542edb6fba48949c0d25a.png)
(1)证明:
;
(2)若
,延长
交
于点
,求证:
.
如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2016/7/27/1572944464273408/1572944470859776/STEM/dbd9a8da005542edb6fba48949c0d25a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a109c829d652632a88ade6924fcda206.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d36d529ae753d360c14b243c1ef7992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18addf44c31c2dc0e4905b365e4801a0.png)
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3 . 已知数列
满足:
,
(
).
(Ⅰ)证明:
;
(Ⅱ)求证:
.
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/bd2039b64cff47128853d9700ce3bbe2.png)
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/85e71469a8b14b77b975c7ec8eb4cb4d.png)
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/fa3b91ba402548c3b1957244b9b32518.png)
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/3607db8bbac24fd683dbae9d0485b572.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/5b1df796ae044ee58afa39ffbe69ccc8.png)
(Ⅱ)求证:
![](https://img.xkw.com/dksih/QBM/2016/7/12/1572916675854336/1572916682113024/STEM/71f5fe36fa1f46d284f7fe0eda5aa5b2.png)
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4 . 用分析法证明:.若△ABC的三内角A、B、C成等差数列,求证:
+
=
.
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/813b892393fa4bedaed06529c133509c.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/25cd6ff8c078426e86d9e19933eca837.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/3b55b32cc4344aafb2ce19eb0776a0b7.png)
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解题方法
5 . 如图,已知AB⊥平面ACD,DE⊥平面ACD,
为等边三角形,
,F为CD的靠近C的四等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/19723d5e-3a0a-4cab-90c7-5c98716114fa.png?resizew=220)
(1)求证:AF∥平面BCE;
(2)请问:平面BCE与平面CDE是否互相垂直?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80ffdaa7e672d194d86b5e4a7ddf931.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/19723d5e-3a0a-4cab-90c7-5c98716114fa.png?resizew=220)
(1)求证:AF∥平面BCE;
(2)请问:平面BCE与平面CDE是否互相垂直?请证明你的结论.
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6 . 已知函数
.
(1)函数
在区间
上是增函数还是减函数?证明你的结论;
(2)若当
时,
恒成立,求正整数
的最大值;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3529bffe1e0ea744850a180f6cad86e.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e881fec40d166eecf66123058faf05fe.png)
(2)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7fde71807463dbdfd8fce1655a5a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520b810441de9d2c08788ad9f2b94a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b863fceeb6ab88ddb1a6875f01563cd.png)
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7 . 设函数
为自然对数的底数.
(I)当
时,函数
在点
处的切线为
,证明:除切点
外,函数
的图像恒在切线
的上方;
(II)当
时,设
是函数
图像上三个不同的点,求证:
是钝角三角形.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/ed7616e9869742c995ae61e6dbe53aab.png)
(I)当
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/a596ecfd6e6442b0929710d03832864e.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/ec6dbbc762c84aa0a356fb60a0c803d7.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/799a5f024f4b4c968f07b8fd04be59e9.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/c9a76dcd5fae4d5e9b61f124750b55c8.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/799a5f024f4b4c968f07b8fd04be59e9.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/ec6dbbc762c84aa0a356fb60a0c803d7.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/c9a76dcd5fae4d5e9b61f124750b55c8.png)
(II)当
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/640669c44a164f3186bad5aebf273116.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/3a306a184aa74b829628055c4b8af2b4.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/87c547d125ad4d6c8311da2965f5386d.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572663424352256/1572663430307840/STEM/cea054dbe1294d2f87e5ba91661bc1ad.png)
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8 . 已知数列
的通项公式为:
(
为自然对数的底数).
(1)计算
,由此推测计算
的公式,并给出证明;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab734dba43a323670575cb5b9c77a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c14d9ae06f864498048d55088ff4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b25842dc8bd28a3982f762b0e3ee96e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397102eb7a8f688e60477035f417c312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2cc6d0626e1b0684c6cd86f9b4339c.png)
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9 . 正
的边长为2,
是
边上的高,
分别是
和
的中点(如图(1)).现将
沿翻折成直二面角
(如图(2)).在图(2)中:
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/38d5e306d13a477299f990dc0fee2ceb.png)
(1)求证:
平面
;
(2)在线段
上是否存在一点
,使
?证明你的结论;
(3)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/0675c286c3cb438585ac2f9b67d0f800.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/07963e3dadb447d091501a49411fcf5e.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/7b499e7a04ba4d38b028550cb36e7705.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/0a245c041053483991cc472b42383a4d.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/18e4dd3ed4eb4c42aaff38c98423364a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/dea62cbfc42c4007b7b7345555c57fb1.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/0675c286c3cb438585ac2f9b67d0f800.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/020534bd75fc4cce8b883c621cc13737.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/38d5e306d13a477299f990dc0fee2ceb.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/2fdddf16856c44ba9406a7429bce8253.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/74b51661ce834a34bdaf2cd3ae564b9a.png)
(2)在线段
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/dea62cbfc42c4007b7b7345555c57fb1.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/2f4bdc4497ad463db02811a5ab8a9006.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/9a9d1970ab34459ca176ba3f47098898.png)
(3)求二面角
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511708672/STEM/4ce62353534943dd80241cd138613f57.png)
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10 . 若数列
满足
,则称
具有性质
.
(I)若数列
具有性质
,
为给定的整数,
为给定的实数.以下四个数列中哪些具有性质
?请直接写出结论.
①
;②
;③
;④
.
(II)若数列
具有性质
,且满足
.
(i)直接写出
的值;
(ii)判断
的单调性,并证明你的结论.
(III)若数列
具有性质
,且满足
.求证:存在无穷多个整数对
,满足
.
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/941fd1c83323404b82eb59b1cc2651da.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/e590c1854a9d47cd8bbf4678e4e14d76.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/2187f03a0102440ebcdac59a477bf4e1.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/3b33744b061e482e847e66dc5fc308b6.png)
(I)若数列
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/8d18db55142f4cde8b214fd5f28dbd4a.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/3b33744b061e482e847e66dc5fc308b6.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/95d176f42c9442b1ac7bf294f7c01d53.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/f152c0f8ebd8459ab099c48882687d59.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/3b33744b061e482e847e66dc5fc308b6.png)
①
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/5555aa09211945b7a5ad446b43e83640.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/c4ee57cf0a784391a5d6af699b797e62.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/e9e298641fb74e01abaae3a75028e533.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/02988b11186a4a87b3d2a4d07da63ba5.png)
(II)若数列
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/2187f03a0102440ebcdac59a477bf4e1.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/3b33744b061e482e847e66dc5fc308b6.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/d3016e8ee4b5403bad530101fd542747.png)
(i)直接写出
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/11a96fa224614e728de2e7346160a87d.png)
(ii)判断
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/2187f03a0102440ebcdac59a477bf4e1.png)
(III)若数列
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/2187f03a0102440ebcdac59a477bf4e1.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/3b33744b061e482e847e66dc5fc308b6.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/0bca47afa88f40f9aceea23aa2b7def1.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/f238f2efd41a4555bcfeb3f881e7b036.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572568586182656/1572568592187392/STEM/ab043b1caf084aaa8972fcf9739306e6.png)
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