某人骑摩托车以20千米/小时的速度向西行驶,感到风从正南方向吹来,而当速度为40千米/小时,感到风从西南方向吹来,求实际风向和风速的大小.
更新时间:2023-01-06 23:09:12
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解题方法
【推荐1】已知三角形的三条中线交于一点
(也称为三角形的重心),且点
将每条中线分为
的两段(如图,
).设
三个顶点分别为
,
,
,求证:
的坐标为
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35cce7126782aea7564f4c5e9f3e3c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fb1a589404b101361fab4a264af920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4adb1a0c5fbcaa7cb61b2febdb7db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd21e0e1bc3b0764d945795068e45bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d734c87ef69582d50e4e3f97ccc184.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4dcbbf269a9c3a6cf49f63841c5373.png)
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解题方法
【推荐2】在平行四边形
中,已知
,且
,
.求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757f417a8372ddae81ff13ed59c48689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19e9066e6ebe86de2108970c51a8b88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f1cb17750870954bb15cd5a7ecb551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8c0a0d535071de1eb29e5cba97e559.png)
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【推荐1】选修4-4:坐标系与参数方程
在直角坐标系中,直线
(
为参数,
),在以
为极点,
轴正半轴为极轴的极坐标系中,曲线
.
(Ⅰ)求曲线
的直角坐标方程;
(Ⅱ)已知点
,若直线
与曲线
交于
两点,且
,求
.
在直角坐标系中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c8c0e5dd7567c6a42d81a39bdfabe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f226d5627884e986a1f3124dd103b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ddd98ea79f9137e5ac9c223a909240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26eba877f6b8ae45c09f2263b5b82a87.png)
(Ⅰ)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4754fbe523ca63eba3810a3f88f37df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f4947ae72c574f1dc8b7b2015d3ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3364b54bf71747e8bed15f431b43649.png)
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【推荐2】已知平行四边形
中,
,
,
和
交于点
.
,
表示向量
.
(2)若
的面积为
,
的面积为
,求
的值.
(3)若
,
,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71692d167f92589f2bd14a092f94c7ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5293eca2d79bde5f3f063f84ffe580d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7239b3f2d88c2e45e17e5de9ae1a332.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3cd61d00f89e68ccca2cac5c937783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceff3844281849df3e37a2e56e110549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d293a71c372907bae2b6234d1d58fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029efb8b2d1490a194c1d67b57b4f422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bac5b9c067002bc06fb400d6c4f3512.png)
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【推荐3】在
中,过重心G的直线与
边交于P,与
边交于Q,点P,Q不与B,C重合.设
面积为
,
面积为
,
,
.
(1)求
;
(2)求证:
;
(3)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41f02922d11b0db07583b49135d73a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d9d8a55bf739736288c0be3607490a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9802946e68ae1c7153b4496ee14735.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08677c8308807e4dca6fd9410d301a39.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐1】一船要从
处驶向正东方向
的
处,此时正有西南风,风速为
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内到达
处,则船至少应以多大的速度,沿什么方向航行?
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【推荐2】以某市人民广场的中心为原点建立平面直角坐标系,x轴指向东,y轴指向北一个单位长度表示实际路程100米,一人步行从广场入口
处出发,始终沿一个方向匀速前进,6分钟时路过少年宫C,10分钟后到达科技馆
.
(1)求此人的位移(说明此人行走的距离和方向)及此人行走的速度(用坐标表示);
(2)求少年宫C点相对于广场中心所在的位置(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d295a4cc3a58f9f38ee98337313c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9744672fa56d04d2be1a5bb160dafe85.png)
(1)求此人的位移(说明此人行走的距离和方向)及此人行走的速度(用坐标表示);
(2)求少年宫C点相对于广场中心所在的位置(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd7f224345271efffc41b5e88437a50.png)
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