21-22高一·湖南·课后作业
1 . 如图,两条笔直的公路相交成60°角,两辆汽车A和B同时从交点O出发,分别沿两条公路行驶.如果汽车A的速度是48km/h,那么汽车B应以多大的速度行驶,才能使这两辆汽车在出发1h后相距43km(结果精确到1km/h)?
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21-22高一·湖南·课后作业
解题方法
2 . 如图,已知点O为平面直角坐标系的原点,点A的坐标为(4,3),点B的坐标为(-1,6),作
,垂足为点D.
,
,
;
(2)求
;
(3)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a67bb733403810fa80c0d758e537645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c388f1f7160d3397610633dfde015fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a82596d3e0eea2ea14448e3ede29c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad71547a1a45cc7b11d6ecde59884c7.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a711bf44ed64556c72fbb0e7f42c27f.png)
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3 . 关于
的二次方程
中,
、
、
是钝角三角形的三边,且边
最长,求证:该方程有两个不相等的实根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6317aa348f4d1c6c57d467400351f5a.png)
![](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/2c94bb12cee76221e13f9ef955b0aab1.png)
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4 . 在
中,
,
.
(1)分别根据下列条件,求
:
①
;②
;③
;④
.
(2)设
,分别求
的取值范围,使
:
①有一解;②有两解;③无解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1554a565064b98271e70055160268a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42190fdb24c6e918e06eb4a2ebf8856f.png)
(1)分别根据下列条件,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
①有一解;②有两解;③无解.
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5 . 一炮弹在A处的东偏北
的某处爆炸,在A处测到爆炸信号的时间比在B处早4秒,已知A在B的正东方、相距6千米,P为爆炸地点(该信号的传播速度为每秒1千米)求A、P两地的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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2021-11-27更新
|
142次组卷
|
2卷引用:沪教版(2020) 一轮复习 堂堂清 第七单元 7.7 双曲线
20-21高一·全国·课后作业
6 . 用硬纸剪一个三边均不等的锐角三角形AOB,然后以AB边上的高
为折痕,折得两个直角三角形,使之直立于桌面上(如图),那么,
就是
在桌面上的射影.转动其中一个直角三角形,观察
与
的大小关系,是否存在某个位置,使
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4336e21256c5b91af87aed2961a31bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4336e21256c5b91af87aed2961a31bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0f2cff2bb265f57705dc30cdced9d8.png)
![](https://img.xkw.com/dksih/QBM/2021/11/11/2849056767778816/2850426585325568/STEM/0292c633c3a941da908faf5f8e6fcab7.png?resizew=329)
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7 . 在△
中,已知
,
,
.建立如图所示的平面直角坐标系,利用两点间的距离公式计算
,并由此证明余弦定理.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5993215cfc7cfdec291c76e76639f53.png)
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20-21高一·全国·课后作业
解题方法
8 . 如图,已知
为定角,P,Q分别在
的两边上,PQ为定长.当P,Q处于什么位置时,
的面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://img.xkw.com/dksih/QBM/2021/11/11/2849052832604160/2849794731360256/STEM/b268b879-8b5c-4166-93d9-8c0f802cfe0b.png?resizew=209)
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20-21高一·全国·课后作业
9 . 如图,作用于同一点
的三个力
,且
,
,
,求
的合力
的大小.(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c25eb4975b46eadd7714bc1923e2998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc10a4927d47666847c6ea480e7dd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1528da09f5a064c5009f206da124e6ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0079c6b4090b677a3718b57e3b577438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c25eb4975b46eadd7714bc1923e2998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dde919c8644b3deeabbde8c7ee7430.png)
![](https://img.xkw.com/dksih/QBM/2021/11/11/2849052165545984/2849792556531712/STEM/8e5f6aab632c4136a4014dd48d1a334f.png?resizew=173)
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10 . 如图,用两根绳子牵引重为
的物体,两根绳子的拉力分别为
,
,此时平衡.如果
,
与
的夹角
.
的大小(精确到1N);
(2)求
与
的夹角
的值(精确到0.1°).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0a7565dbb8e665bb691d1de0c73675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6773de8f14f06da06bf9c6f22738c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3bea7383acbd1da6d0d5f10ef1b2aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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