解题方法
1 . 已知平面四边形
中,四边分别为:
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d829e1e4e92479ee7ee91316a1020df8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b547d886c528fa2c63016c217b8fb51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d829e1e4e92479ee7ee91316a1020df8.png)
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解题方法
2 . 某处有一块闲置用地,如图所示,它的边界由圆O的一段圆弧
和两条线段
,
构成.已知圆心O在线段
上,现测得圆O半径为2百米,
,
.现规划在这片闲置用地内划出一片梯形区域用于商业建设,该梯形区域的下底为
,上底为
,点M在圆弧
(点D在圆弧
上,且
)上,点N在圆弧
上或线段
上.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/c6222bb9-a391-4a91-8406-21126f998d5d.png?resizew=173)
(1)将梯形
的面积表示为
的函数;
(2)当
为何值时,梯形
的面积最大?求出最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a4c11d41372175ba3541a44c3376b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719d071fa86799218653af756956b7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb35158a52a23a6e57ff890cef8c7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/c6222bb9-a391-4a91-8406-21126f998d5d.png?resizew=173)
(1)将梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e22545a765af9563ea7c8db75c16df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e22545a765af9563ea7c8db75c16df6.png)
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3 . 已知函数
(
,
,
),M是函数
图象的一个最高点,K,N是函数图象上与它距离最近的两个对称中心,
是边长为1的正三角形,
,若函数
为偶函数,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7107b4a0d1ca5eb5f360aed4c4f1306e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13378be06b6b01bcad1d261ff14e87cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4456675a5dbe545462a22cef9aca8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248dba78ba95c72cbfbd2458c0631ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0ff247e064568665bca7c6a4a2af08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4664c6dda7dc39debd14548fccb80039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91222ef9cba039e3f19d5658cae245c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae6b16630d99dc4f533add1fd748797.png)
A.![]() | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
2020-06-18更新
|
286次组卷
|
3卷引用:山东省菏泽市东明县第一中学2018-2019学年高一下学期期中数学试题
解题方法
4 . 已知函数
.
(1)求
的单调递减区间;
(2)若
在区间
上的最小值为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1dcb00f1798137b01ccc92a3039e16.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a7e7dacfb9f96851c21b02a6f2a6081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
5 . 已知平面上三点A,B,C的坐标依次为
,
,
.
(1)若
为直角三角形,且角A为直角,求实数k的值;
(2)在(1)的条件下,设
,
,若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed37520eb88c41828ad26f0a2b2de971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47fa19dde2fb0cc8274390a05a6095cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00999ca76efc3763c13c6b4260c4498.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e49d2c72a35f1ce4d1d26574934a014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a303aee4aea8d84cfa947002b0eaeb1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768434e9275596ec3f60ec46454a16e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbae94f2dd5086f7ddbe18407a978e9b.png)
您最近一年使用:0次
2020-03-03更新
|
729次组卷
|
4卷引用:山东省菏泽市东明县第一中学2018-2019学年高一下学期期中数学试题
6 . 光线从点
射向y轴,经过y轴反射后过点
,则反射光线所在的直线方程是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ae286ae8a209bc659ace6354b79abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623afc24f2227004b0e1b3922dfb954b.png)
您最近一年使用:0次
2019-08-01更新
|
1359次组卷
|
3卷引用:安徽省皖西南联盟2018-2019学年高一下学期期末联考数学试题
7 . 如图,在
中,D为BC的中点,G为AD的中点,过点G任作一直线MN分别交AB,AC于M,N两点,若
,
,试问:
是否为定值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a398a79942d381cab12d13bf4028d5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b84e1b1028bc6b7432d4262251aa29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/5c2830df-cb47-4b61-9e58-cc79a39552db.png?resizew=149)
您最近一年使用:0次
2019-05-17更新
|
431次组卷
|
2卷引用:步步高高一数学暑假作业:作业24 平面向量基本定理及坐标表示
8 . 设函数
,则下列结论正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87417531276ff0e771b85333820d1532.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() |
D.![]() |
您最近一年使用:0次