名校
解题方法
1 . 某中学校园内有块扇形空地
,经测量其半径为
m,圆心角为
.学校准备在此扇形空地上修建一所矩形室内篮球场ABCD,初步设计方案如图1所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/0f279aa4-db46-4272-a3c6-3574b5d8ad96.png?resizew=480)
(1)求出初步设计方案中矩形ABCD面积的最大值.
(2)你有没有更好的设计方案来获得更大的篮球场面积?若有在图2画出来,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6c71a0da6a878a5b12bf8a8e784645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/0f279aa4-db46-4272-a3c6-3574b5d8ad96.png?resizew=480)
(1)求出初步设计方案中矩形ABCD面积的最大值.
(2)你有没有更好的设计方案来获得更大的篮球场面积?若有在图2画出来,并证明你的结论.
您最近一年使用:0次
名校
2 . 已知有两只蚂蚁小红和小白在单位圆上活动,且有点
,点
.
![](https://img.xkw.com/dksih/QBM/2022/5/1/2970051749396480/2970659656695808/STEM/7b69c0dd-dbf3-4f06-9154-09949c055dac.png?resizew=229)
(1)设小红所在位置为
,小白所在位置为
,
.不妨设
.那么小红和小白的直线距离为___________;
(2)如果小红和小白分别从
、
两点以相同的速度沿圆周分别以逆时针方向和顺时针方向爬行,且没有碰面.求两只蚂蚁所在位置(分别视为一个点)及
、
两点构成的四边形周长的最大值?
(3)如果小红和小白沿圆周随意溜达,这两只蚂蚁没有碰面且都没有在
点,那么这两只蚂蚁所在位置(分别视为一个点)和
点构成三角形.这类三角形周长最大值为___________;并予以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://img.xkw.com/dksih/QBM/2022/5/1/2970051749396480/2970659656695808/STEM/7b69c0dd-dbf3-4f06-9154-09949c055dac.png?resizew=229)
(1)设小红所在位置为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05658511cc8728f4a77fbed890a637a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9faa86fd7ec41cacc3ff1859a9b1fc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c137e7ca5167b58df204c74db6c976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
(2)如果小红和小白分别从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如果小红和小白沿圆周随意溜达,这两只蚂蚁没有碰面且都没有在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
名校
解题方法
3 . 定义函数
为“正余弦”函数.结合学过的知识,可以得到该函数的一些性质:容易证明
为该函数的周期,但是否是最小正周期呢?我们继续探究:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216fe768d8ce994867dde9ad5708d7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4fb17f6c4d2a854d76062ee167c6c.png)
.可得:
也为函数
的周期.但是否为该函数的最小正周期呢?我们可以分区间研究
的单调性:函数
在
是严格减函数,在
上严格增函数,再结合
,可以确定:
的最小正周期为
.进一步我们可以求出该函数的值域了.定义函数
为“余正弦”函数,根据阅读材料的内容,解决下列问题:
(1)求“余正弦”函数的定义域;
(2)判断“余正弦”函数的奇偶性,并说明理由;
(3)探究“余正弦”函数的单调性及最小正周期,说明理由,并求其值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051f44b01baed6574abaca7f3d7b6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2d7c958e99bcd9d7f251c19ee3544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216fe768d8ce994867dde9ad5708d7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4fb17f6c4d2a854d76062ee167c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa1dd1e3ecbf87b4c4a2b4ab71f5859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051f44b01baed6574abaca7f3d7b6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051f44b01baed6574abaca7f3d7b6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051f44b01baed6574abaca7f3d7b6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d51992c05a557cf6058664f1f8961e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8386e2f935d78f9137e1d9cb050223e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b429642b4cc19a976d2592c3bf685ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051f44b01baed6574abaca7f3d7b6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430d24c464431cb2900239095f23f9bf.png)
(1)求“余正弦”函数的定义域;
(2)判断“余正弦”函数的奇偶性,并说明理由;
(3)探究“余正弦”函数的单调性及最小正周期,说明理由,并求其值域.
您最近一年使用:0次
解题方法
4 . 已知在
中,点
,
分别为
,
的中点.
(1)若
的面积为
,
,
且
为锐角,求
的长;
(2)若
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58d16c9d123c7c778f7abc3c8331242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6fbcf04c452f0b183c4473bf440bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e520cef3cebf757a24737ffb661834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611b0ea4a4005cc50eaa68a6be62eda6.png)
您最近一年使用:0次
2021-11-15更新
|
140次组卷
|
2卷引用:河南省商丘市部分学校联考2021-2022学年高二上学期期中考试文科数学试题
名校
5 . 如图,有一个三角形的湿地公园,其中
,点D在
上,且
,点D为公园入口.为了方便游客观光,拟在
上选择一点E,在
上选择一点F,修建三条观光廊桥
,且要求
,设
.
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470992384/STEM/d5b405b22484496e97b433f118010cda.png?resizew=227)
(1)当
变化时,求证:廊桥
与
的长度比值为定值;
(2)为节约修建成本,求三条廊桥长度和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43136f56e59f3f9e878d0c5d4ccbeecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49efa5eaff3ee56f13e121c1fc294eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aade83af002b001a9367c2226dcfcda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3bba5bd11e850c9b766c2ba6c426d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2132c3d137d2f80fabf328ddb09f8ff.png)
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470992384/STEM/d5b405b22484496e97b433f118010cda.png?resizew=227)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)为节约修建成本,求三条廊桥长度和的最小值.
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名校
解题方法
6 . 已知正
的边长为
,内切圆圆心为
,点
满足
.
(1)求证:
为定值;
(2)把三个实数
,
,
的最小值记为
,b,c},若
,求
的取值范围;
(3)若
,
,求当
取最大值时,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8180faf978008d2bc7704cb69c3c40.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304010e1253e0fc6f7578c210be321f9.png)
(2)把三个实数
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4ac0a523138c4597301dbd6ed3abb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb980e0614df97e69a89948d3b21ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20fc69bb272fc609c2a7c95f888373c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc95236ed98064b97d67045706a21906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d380dea30f490babb2aef4edc49afc6.png)
您最近一年使用:0次
2021-08-26更新
|
1632次组卷
|
4卷引用:浙江省温州中学2020-2021学年高一下学期期中数学试题
解题方法
7 . 已知函数
,其中
.求证:
(1)
,且
;
(2)
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4d6363133c710c00b99fafa01dce16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1948bdb9bfc6493bc0e596d9a0dab5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accad8245514b083d7434160085188fd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9f295a43c5d78cf9518456fef0abda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32474ff2d16bb427dc7426e481b20709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2479b7fa52eafe0e011435864bfe9c37.png)
您最近一年使用:0次
解题方法
8 . 若
是边长为2的正三角形.请在
内画一条线段
,端点
,
都在
的边上,并将正
分成面积相等的两部分.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/bb47287d-d131-442e-85bc-7a7bf1c13eeb.png?resizew=124)
(1)请给出线段
的一种画法,并证明;
(2)如果此时线段
是所有画法中最短的,求此时该线段的长度;
(3)请提出一个类似(2)的问题(不需要解决你提出的问题).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/bb47287d-d131-442e-85bc-7a7bf1c13eeb.png?resizew=124)
(1)请给出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如果此时线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)请提出一个类似(2)的问题(不需要解决你提出的问题).
您最近一年使用:0次
名校
9 . 已知点D,P在锐角
所在的平面内,且满足
,
.
(1)若
,求实数
,
的值;
(2)已知
,其中
为
的面积.
①求证:
;
②求
的最小值,并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8488ec91652ad560475f6d45c8e20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59cbb44ed46540f65fa7efb5e313144.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57766a96c4b7e39bc224fa5917c6be22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ec4fc7447298cbd6f51ee9977b005f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2aa7ba35117b8963954c65934c8f8c.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39344ad1a4a45a1023de6b5bdda76546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
您最近一年使用:0次
解题方法
10 . 若实数
,
,且满足
,则称x、y是“余弦相关”的.
(1)若
,求出所有与之“余弦相关”的实数
;
(2)若实数x、y是“余弦相关”的,求x的取值范围;
(3)若不相等的两个实数x、y是“余弦相关”的,求证:存在实数z,使得x、z为“余弦相关”的,y、z也为“余弦相关”的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d52a3901d0ee9460954be401f2a5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f23b00badd3201abb15ae8a77ab4e3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a2ec02caf837c6e7e0b76dd9acc7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)若实数x、y是“余弦相关”的,求x的取值范围;
(3)若不相等的两个实数x、y是“余弦相关”的,求证:存在实数z,使得x、z为“余弦相关”的,y、z也为“余弦相关”的.
您最近一年使用:0次