解题方法
1 . 如图,从气球A上测得正前方的河流的两岸B,C的俯角分别为
、
,其中
,
.如果这时气球的高度
,则河流的宽度BC为( )
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601363963904/2929565091766272/STEM/aee24a57-5740-42b5-b1f7-24f456bb687c.png?resizew=205)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d5a9690d02c2b1e6bbd6fd05225c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a98ab626da2f1ed939e2e157e422e2.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922601363963904/2929565091766272/STEM/aee24a57-5740-42b5-b1f7-24f456bb687c.png?resizew=205)
A.![]() | B.![]() | C.![]() | D.![]() |
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2卷引用:河南省洛阳市2021-2022学年高二上学期期末考试数学(理)试题
名校
解题方法
2 . 在
中,三个内角A,B,C的对边分别为a,b,c,若
,
,
,则
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e02e6946143207c276f7430942c1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74c4f3040823667e281483bf24ee35f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.1 | C.![]() | D.2 |
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3卷引用:河南省洛阳市2021-2022学年高二上学期期末考试数学(理)试题
3 . 如图,在平面直角坐标系
中,点
为单位圆与
轴正半轴的交点,点
为单位圆上的一点,且
,点
沿单位圆按逆时针方向旋转角
后到点
.
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922749324402688/2927462272851968/STEM/c64b0d08-9e97-4758-b6c8-14e625fdf0d5.png?resizew=175)
(1)当
时,求
的值;
(2)设
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94048a49b1f6a3858c2b301ae7d856fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8544f8483269db90305fa747eeac8b4d.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922749324402688/2927462272851968/STEM/c64b0d08-9e97-4758-b6c8-14e625fdf0d5.png?resizew=175)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df437f0978f6c3b3d3cb804651d97716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
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解题方法
4 . 已知函数
,
.
(1)求函数
的最小正周期和单调递减区间;
(2)用括号中的正确条件填空.函数
的图象可以用下面的方法得到:先将正弦曲线
,
向___________(左,右)平移___________(
,
)个单位长度;在纵坐标不变的条件下再把所得曲线上各点的横坐标变为原来的___________(
,2)倍,再在横坐标不变的条件下把所得曲线上各点的纵坐标变为原来的___________(
,2)倍,最后再把所得曲线向___________(上,下)平移___________(1,2)个单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4ab91478419f904a4d28d3d5cbeb91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)用括号中的正确条件填空.函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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5 . 水车在古代是进行灌溉引水的工具,是人类的一项古老的发明,也是人类利用自然和改造自然的象征.如图是一个半径为
的水车,以水车的中心为原点,过水车的中心且平行于水平面的直线为
轴,建立如图平面直角坐标系,一个水斗从点
出发,沿圆周按逆时针方向匀速旋转,且旋转一周用时
秒.经过
秒后,水斗旋转到
点,设
点的坐标为
,其纵坐标满足
,当
秒时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05c938fd42f5cb0b9d21cd44acbec6e.png)
___________ .
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922749324402688/2927462272483328/STEM/21cdb102-f6a0-43b2-ac27-41b9ca996deb.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2459c8a0098b6d23be565665fb1a572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd121f4aeca8a78a320fca1fd1c4d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12edceb28bd2db3a31665699a0d2ba27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372bf30440fb53910efc7dfb1b79cc08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05c938fd42f5cb0b9d21cd44acbec6e.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922749324402688/2927462272483328/STEM/21cdb102-f6a0-43b2-ac27-41b9ca996deb.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922749324402688/2927462272483328/STEM/69809f6b-5946-46a6-aae7-46a7fa397d12.png?resizew=160)
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解题方法
6 . 已知
,
为锐角,
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfc260bc8a572a6062930704eb8bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c495cc17fda0921260cad544a35d33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b04da7eac640b5b735da7fb5da8cfd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 下列关于函数
,
的单调性叙述正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08921a72d608d1618d765569e752a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58119f48aa8860923d1f13dd78a17c62.png)
A.在![]() ![]() |
B.在![]() ![]() |
C.在![]() ![]() ![]() |
D.在![]() ![]() ![]() |
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解题方法
8 . 已知
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4306b944f46c6f8820960a57059a393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3卷引用:河南省洛阳市2021-2022学年高一上学期期末数学试题
9 .
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405f0afc5c76a71620e9cd6f6e58f7d5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
10 . 已知函数
的部分图象如图所示,则能够使得
变成函数
的变换为( )
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900512374505472/2909020350324736/STEM/4ee8886b-09d2-469f-b56c-20d082e53497.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668cb4c5c3cdb417bdfcd92dd1666c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e769299acbcc266a35ddd6848452f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900512374505472/2909020350324736/STEM/4ee8886b-09d2-469f-b56c-20d082e53497.png?resizew=142)
A.先横坐标变为原来的![]() ![]() |
B.先横坐标变为原来的![]() ![]() |
C.先向右平移![]() ![]() |
D.先向左平移![]() ![]() |
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