1 . 在
中,内角A,B,C的对边分别为a,b,c,点D为边
上一点,且满足
.
(1)证明:
;
(2)若
为内角A的平分线,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbb66c477a0b0ab67e5759b72c3c802.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b857c7ca55dfa6da108df1d3cee2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e828b8edf7a8f2cdcfceb13a4e05bf6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
您最近一年使用:0次
解题方法
2 . 在
中,
.
(1)求角B;
(2)若
,D是
中点,且
,求b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f807e66f538fd22ac305259ce4bd5931.png)
(1)求角B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07abc09e1f0bf5eb87259e3381b3316a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29470a095de205acb450d5a48b38be1f.png)
您最近一年使用:0次
名校
解题方法
3 . 已知
,
,
,设
是直线
上一点(
为坐标原点),求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb092317983577ae791b3c6617f46a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae130591f1c7275f0eff74ede494fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006219a04b138b2edf6e2dd610a51da1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3cd639d381fb8f5675d8528ef19e0ae.png)
您最近一年使用:0次
2021-04-02更新
|
150次组卷
|
2卷引用:河北省张家口市宣化第一中学2020-2021学年高一下学期6月月考数学试题
4 . 如图,用两条同样长的绳子拉一物体,物体受到的重力为G,两绳受到的拉力分别为F1、F2,夹角为θ.
![](https://img.xkw.com/dksih/QBM/2016/11/29/1836136185847808/1826269012426752/STEM/1df45f61-d235-4fc3-ab9e-ed9e755749d2.png?resizew=132)
(1)求其中一根绳子受的拉力|F1|与G的关系式,用数学观点分析|F1|的大小与夹角θ的关系;
(2)求|F1|的最小值;
(3)如果每根绳子的最大承受拉力为|G|,求θ的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/11/29/1836136185847808/1826269012426752/STEM/1df45f61-d235-4fc3-ab9e-ed9e755749d2.png?resizew=132)
(1)求其中一根绳子受的拉力|F1|与G的关系式,用数学观点分析|F1|的大小与夹角θ的关系;
(2)求|F1|的最小值;
(3)如果每根绳子的最大承受拉力为|G|,求θ的取值范围.
您最近一年使用:0次
2017-11-27更新
|
661次组卷
|
3卷引用:河北省张家口市第一中学2020-2021学年高一下学期期中数学试题
河北省张家口市第一中学2020-2021学年高一下学期期中数学试题(已下线)同步君人教A版必修4第二章2.5.2向量在物理中的应用举例高中数学人教版 必修4 第二章 平面向量 2.5.2 向量在物理中的应用举例
9-10高一下·内蒙古通辽·期末
5 . 已知
是同一平面内的三个向量,其中![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/cc6862c735854a5cbb78a5fd47a40757.png)
(1)若
,且
,求:
的坐标
(2)若
,且
与
垂直,求
与
的夹角
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/250c44a0b2db4a17aa50fc7b43e22ab1.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/cc6862c735854a5cbb78a5fd47a40757.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/55845bac6fbf46958510b55f02359642.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/f0774ac1457d4febaec03b3d9867ffd2.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/bd6c7d5d9d464ea699d6d47cce7c037b.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/4a4a616a95874a33bfa12910925eda34.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/b88e4fc9586f4fa390d91a9dcd8bdbd0.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/4777dbfc592c4516b192f144acc0787f.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/a104a951d46647b48f2538f77bd566c0.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571404277293056/1571404283027456/STEM/58b4d3e0ba054ab59b2cb16546d176ed.png)
您最近一年使用:0次
2016-11-08更新
|
1331次组卷
|
4卷引用:河北省张家口市2017-2018学年高一上学期期末考试数学试题2
河北省张家口市2017-2018学年高一上学期期末考试数学试题2(已下线)2010年内蒙古通辽一中高一下学期期末考试数学卷(已下线)2014届江苏省泰兴市第三高级中学高三上学期期中调研测试数学试卷2017届山东寿光现代中学高三10月月考数学(文)试卷