解题方法
1 . “绿水青山就是金山银山”是时任浙江省委书记习近平于2005年8月在浙江湖州安吉考察时提出的科学论断,随着生态环境治理的不断加强,园林局美化城市的功能日益凸显.时值中国共产党成立100周年之际,某市园林局计划把一块形状为等边三角形的边角地开辟为特种花草栽种基地,如图,边角地
是边长为100米的等边三角形,根据实际情况,需在基地修一条直行道路
在边
上,
在边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/72a59f44-0e71-4273-b12a-41509f3d9971.png?resizew=200)
(1)若
把基地分成周长相等的两部分,设
的长为
米,试把
的面积表示为
的函数
,并求出
的定义域及
的最大值;
(2)若
把基地分为面积相等的两部分,当
取多长时,道路
最短.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce82ac8555e0d0a670b5bf6e2ec28374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5676b8028e2217e9cd8b404ca70b9485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58982e012eb84554840ba2d6467f54eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/72a59f44-0e71-4273-b12a-41509f3d9971.png?resizew=200)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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解题方法
2 .
中,角
所对的边分别为
,已知A、B、C成等差数列,
.
(1)求角B的大小;
(2)求△ABC周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4cd80d3092f506d6326df7d552eb3b.png)
(1)求角B的大小;
(2)求△ABC周长的取值范围.
您最近一年使用:0次
名校
解题方法
3 . 已知等差数列
的前
项和为
,等比数列
的前
项和为
,已知
.
(1)求数列
,
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadd51d72723320ae712a8a7622551cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31709d304949bd0f9bb4be389f3329b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb1f61455d789b795a3e24242b5f426.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2acfad2fb9751f07f7a35fcbeab13d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cca3ebd10a38201939a3694cc95186a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
您最近一年使用:0次
2022-06-14更新
|
386次组卷
|
2卷引用:四川省德阳市2020-2021学年高一下学期期末数学试题
名校
解题方法
4 . 已知向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f1b1d236c77645c4a610c7c45a0b89.png)
(1)设向量
与
的夹角为
,求
;
(2)计算
在
方向上的投影;
(3)若向量
与向量
垂直,求实数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec0d30252d9cd1ebf9e5c894ce47f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f1b1d236c77645c4a610c7c45a0b89.png)
(1)设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b278158157e3e0b59a4eeba058b515f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
解题方法
5 . 如图所示,已知半径为2,圆心角为
的扇形OAB,四边形CDEF是扇形的内接矩形,E,F两点在圆弧上,OG是
的平分线,G在
上,连接OF,记
,则角
为何值时,矩形CDEF的面积最大?并求最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554d5d0e557fe3c4162046d40c90324b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/367103f8-69e5-4492-8749-9fa2be8b5ec8.png?resizew=212)
您最近一年使用:0次
解题方法
6 . 如图,正方体
的棱长为1,线段
上有两个动点E,F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/d9a371c8-e3ee-44d7-812c-548d9e316c1f.png?resizew=195)
(1)求证:
平面ABCD;
(2)求证:
;
(3)三棱锥
的体积是否为定值,若是,求出该定值,若不是,说明理由(棱锥的体积
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e438a162ed349f7f25333e8f6c044e6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/d9a371c8-e3ee-44d7-812c-548d9e316c1f.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589ddae20626f9aaac616d2a3b5d95bd.png)
(3)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc3bf74119692ac98eb24fcfa2a3f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7309683ff41a94e5c5cfeabaeda52a.png)
您最近一年使用:0次
7 . 已知数列
的前
项和
,其中
.
(1)求数列
的通项公式;
(2)若数列
满足
,
,求数列
的前
项和
;
(3)若存在
,使得
成立,求实数
的最小值.
![](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/5fc5eac09ed870c6711d94e558a25a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9988a28eca78bd4f93ad9d50a855449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdbcc25664ba5c8ff72788f3c316690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
8 . 求解下列问题:
(1)解不等式:
;
(2)已知函数
.若对于
,
恒成立,求实数
的取值范围.
(1)解不等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a105306f8c0ea890fdbeba803ded88.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c320c1a1eae939018226067144497b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2022-06-13更新
|
944次组卷
|
3卷引用:四川省成都市天府新区2020-2021学年高一下学期期末学业水平监测数学(理)试题
四川省成都市天府新区2020-2021学年高一下学期期末学业水平监测数学(理)试题(已下线)突破2.3 二次函数与一元二次方程、不等式(重难点突破)吉林省吉林市第四中学2022-2023学年高一上学期第一次月考数学试题
名校
9 . 如图,在
中,已知点
,
分别在边
,
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/487d1fb1-18a2-48c6-9f66-eaa3f339c961.png?resizew=173)
(1)用向量
,
表示
;
(2)设
,
,
,求角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7749006d7e99bbec95b12e044bf8f87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179bb3ea6805d27e9490144ecd674e09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/487d1fb1-18a2-48c6-9f66-eaa3f339c961.png?resizew=173)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2cf03ac7a1b0aba75daa3b9f9b5768.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2062d1390ac135636bf90a43f7e8be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
2022-06-13更新
|
442次组卷
|
2卷引用:四川省成都市天府新区2020-2021学年高一下学期期末学业水平监测数学(理)试题
名校
10 . 如图,正方体
的棱长为1,线段
上有两个不同的动点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/10bf0881-c35e-4fa0-971a-7799059f02ab.png?resizew=269)
(1)求证:
平面
;
(2)求证:
;
(3)二面角
的大小是否为定值,若是,求出其余弦值;若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/10bf0881-c35e-4fa0-971a-7799059f02ab.png?resizew=269)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589ddae20626f9aaac616d2a3b5d95bd.png)
(3)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770d42343599d3f26f0e0de8d5849f52.png)
您最近一年使用:0次
2022-06-13更新
|
1482次组卷
|
2卷引用:四川省成都市天府新区2020-2021学年高一下学期期末学业水平监测数学(理)试题