名校
1 . 设
是定义在
上的奇函数,且当
时,
单调递减,若
,则
的值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ec808ad60dbf016632ec816eaca1df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc8f775c0c874c4ea920136a91db8f.png)
A.恒为负值 | B.恒等于零 |
C.恒为正值 | D.无法确定正负 |
您最近一年使用:0次
2019-09-15更新
|
669次组卷
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9卷引用:甘肃省兰州市第五十中学2022-2023学年高三上学期第一次模拟考试数学(文科)试题
甘肃省兰州市第五十中学2022-2023学年高三上学期第一次模拟考试数学(文科)试题四川省眉山市眉山中学2017-2018学年高一10月月考数学试题山西省应县第一中学校2018-2019学年高二下学期期末考试数学(理)试题(已下线)专题11.2 直接证明与间接证明(练)【文】-《2020年高考一轮复习讲练测》(已下线)专题12.2 直接证明与间接证明、数学归纳法(精练)-2021届高考数学(文)一轮复习讲练测(已下线)专题12.2 直接证明与间接证明 (精练)-2021届高考数学(文)一轮复习学与练(已下线)专题12.2 直接证明与间接证明、数学归纳法(精练)-2021年高考数学(理)一轮复习讲练测(已下线)专题12.2 直接证明与间接证明、数学归纳法 (精练)-2021年高考数学(理)一轮复习学与练重庆市蜀都中学2020-2021学年高二上学期11月月考数学试题
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2 . 如图所示,已知直线
的方程为
,⊙
,⊙
是相外切的等圆.且分别与坐标轴及线段
相切,
,则两圆半径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
__________ (用常数
表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f6e613ffa032e7e893daa1970d3948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b2bc7331e651f466890b46111b962e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/4c1689d5-6d77-40e0-b08d-9da2426bc4fc.png?resizew=171)
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2018-05-25更新
|
184次组卷
|
2卷引用:【全国百强校】安徽省合肥市第一中学2018冲刺高考最后1卷理科数学试卷
名校
3 . 如图,在圆内接四边形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925091064176640/1927240651849728/STEM/650e0052-8337-4afc-aacd-d76868387aeb.png)
(1)求
的大小;
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de006cef9e5efbcbf74229845804650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925091064176640/1927240651849728/STEM/650e0052-8337-4afc-aacd-d76868387aeb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
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2018-04-19更新
|
153次组卷
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2卷引用:2018年陕西省咸阳市第二次模拟理数试题
真题
4 . 选修4—1:几何证明选讲 如图,直线AB为圆的切线,切点为B,点C在圆上,∠ABC的角平分线BE交圆于点E,DB垂直BE交圆于D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/5365865e-1cc9-47a2-9e47-f3464ca9a3c5.png?resizew=160)
(Ⅰ)证明:DB=DC;
(Ⅱ)设圆的半径为1,BC=
,延长CE交AB于点F,求△BCF外接圆的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/5365865e-1cc9-47a2-9e47-f3464ca9a3c5.png?resizew=160)
(Ⅰ)证明:DB=DC;
(Ⅱ)设圆的半径为1,BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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2019-01-30更新
|
3926次组卷
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12卷引用:2014届甘肃省兰州一中高考模拟一理科数学试卷
(已下线)2014届甘肃省兰州一中高考模拟一理科数学试卷(已下线)2014届甘肃省兰州一中高考模拟一文科数学试卷2013年全国普通高等学校招生统一考试理科数学(新课标1卷)2013年全国普通高等学校招生统一考试文科数学(新课标1卷)(已下线)2014年高考数学文二轮专题复习与测试选修4-1几何证明选讲练习卷2015届黑龙江省哈尔滨六中高三上学期期末考试理科数学试卷2015届江西省吉安市第一中学高三上学期第二次阶段考试文科数学试卷2015届陕西省西安长安区一中高三上学期第三次质检理科数学卷2015届陕西省西安长安区一中高三上学期第三次质检文科数学卷2016届甘肃省会宁县一中高三上第四次月考理科数学试卷2016届湖北省宜昌市一中高三上学期12月月考数学试卷河北省武邑中学2017届高三下学期第一次质检考试数学(文)试题
2018高三·全国·专题练习
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5 . 已知函数
,若方程
恰有三个实数根,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ee975cd32e42962d574dcc23daab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe68aa8a21f26b6b9f6889369aa5905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2017-03-17更新
|
660次组卷
|
3卷引用:2017届福建省宁德市高三第一次(3月)质量检查数学理试卷
2017届福建省宁德市高三第一次(3月)质量检查数学理试卷(已下线)2-8 函数与方程(高效训练)-2019版导学教程一轮复习数学(人教版)山西省应县第一中学校2018-2019学年高二下学期期末考试数学(理)试题
6 . (选修4-1:几何证明选讲)在圆O中,AB,CD是互相平行的两条弦,直线AE与圆O相切于点A,且与CD的延长线交于点E,求证:AD2=AB·ED.
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699409391165440/1699652214628352/STEM/9743b396f71848a6950fd9e471ee5b55.png?resizew=239)
您最近一年使用:0次
名校
7 . 在平面直角坐标系中,将曲线
上的每一个点的横坐标保持不变,纵坐标缩短为原来的
,得到曲线
,以坐标原点
为极点,
轴的正半轴为极轴,建立极坐标系,
的极坐标方程为
.
(1)求曲线
的参数方程;
(2)过原点
且关于
轴对称的两条直线
与
分别交曲线
于
和
,且点
在第一象限,当四边形
周长最大时,求直线
的普通方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f917a2022014d9c19c29eeac84c74e2f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)过原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f90eb172dbd2ff7ae6f705801c0737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
您最近一年使用:0次
2017-04-15更新
|
1238次组卷
|
7卷引用:2017届河北省石家庄市高三一模考试(文科)数学试卷
8 . 选修4-1:几何证明选讲
如图,
为
的直径,过点
作
的切线
交
于点
的延长线交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/12/22/1619402851647488/1619402852311040/STEM/4b8c1e8cfa464e90995e6a12224c36a1.png)
(1)求证:
;
(2)若
,求
和
的长.
如图,
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eab767f07893891de2f6558d45e9b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07f3700c45a84b02f153ea0fb20b4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2016/12/22/1619402851647488/1619402852311040/STEM/4b8c1e8cfa464e90995e6a12224c36a1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c87427f4af230ba9e20ba9446a922.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd2c6dbd4815508d9480ed15277fe5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
9 . 选修4-1:几何证明选讲
如图,等边三角形
内接于圆
,以
为切点的圆
的两条切线交于点
,
交圆
于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/81a2034bb5884dbb8fb950289d74455b.png)
(1)求证:四边形
为菱形;
(2)若
,求等边三角形
的面积.
如图,等边三角形
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b14f487803734a408ef11a0a24ab6cb3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b9aaa9937d4947ac8e9fdebd4a81c03e.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/0d182b60a23f4c2dbfd61088479c4ccb.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/7b36e47cb3b449099c42caa838f69826.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/da51e06ba72147f0b7cf56d180428ad0.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/81a2034bb5884dbb8fb950289d74455b.png)
(1)求证:四边形
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/aae1360d683b409d8355fbf24ba4bec4.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/6be006f766f04a38b903a6283d9e7b33.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b14f487803734a408ef11a0a24ab6cb3.png)
您最近一年使用:0次
10 . 选修4-1:几何证明选讲
已知:如图,在
中,
,以
为直径的
交
于点
,过点
作
,垂足为
,连结
交
于点
.求证:
![](https://img.xkw.com/dksih/QBM/2016/10/15/1573071473934336/1573071480078336/STEM/37ca4f1c9df9480da54a79ec9dbd72d3.png)
(Ⅰ)
是
的切线;
(Ⅱ)
.
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9c90cfd058a3f1158b76f7e23819eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9eadc2feca23f49e36ade66f66512e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/10/15/1573071473934336/1573071480078336/STEM/37ca4f1c9df9480da54a79ec9dbd72d3.png)
(Ⅰ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce78c2b25f0293eb4a3f54c4bb68e9f6.png)
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