已知向量
,
(1)若
,求实数m的值;
(2)求以
与
为邻边的三角形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b2f78f5237379e51a2af85bc857d970.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78deffd3913e7665c545312d5b3ab3f6.png)
(2)求以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4e49d17d4ad440d37c6f4bc8daba25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
更新时间:2024-05-21 14:26:13
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图在锐角
中,内角
的对边分别是
,若
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712400768770048/2717886979817472/STEM/837d13f2-efd1-4aba-927b-444b4e8dc760.png?resizew=233)
(1)求角
;
(2)若在线段
上存在一点
,使得
,
为
延长线上一点,
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f320f1a83cce482ed23838c0d2a4e55.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712400768770048/2717886979817472/STEM/837d13f2-efd1-4aba-927b-444b4e8dc760.png?resizew=233)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133f14539e3090e18427017ff212d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8b0acd214adce8b19df1e586d41be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a552f9f322cf0b4c272af58bad4e2ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐2】为美化校园环境,学校后勤处准备在一块直径为
的半圆空地(如图所示)上进行绿化改造,规划在
外的地方种草,
的内接正方形
建一个小型水池,其余地方种花,若
的面积为
,正方形
的面积为
,将比值
称为“规划合理度”.
表示
和
;
(2)若
为定值,
变化时,求“规划合理度”
的最小值,并求取得最小值时的
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810bd5a432c5b89016280b25dbd1a904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665cfec8ab4d3e3f7d972a52c73fa254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知向量
,
.
(1)若
与
垂直,求实数
的值;
(2)若对任意的实数m,都有
,求实数
的取值范围;
(3)设非零向量
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a29b360f552c75ed218c966319f492c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3faf74fe3a181b40775b5c92e0dcf1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0067ea61ac2abd75b17f906c13fd6879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cae1180d7aa8a3265a9ae557958130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若对任意的实数m,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80da7b55da9319fbf4dd6f1b87a92425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)设非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc64b3cbf69f83e8720f33c63d713589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa784cbdc33ee8f90e073866c1b1c040.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知向量
,
,其中
.
(1)当
时,求x值的集合;
(2)
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85c0ad60f2bab4c1fe660ee013b40e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48062a415d81f451051af234dfa44774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec25b105130d71d3d529524671b6218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc23a04cdac6439ea170e799f1c1df5.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知函数
,
.
(1)已知
,求
的值;
(2)已知
的内角A、B、C的对边分别为a、b、c,且
,c=3,若向量
与
垂直,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd7c8de7813b1b33f8717107839a143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e4c8c30e8a962aa563b1bb551a6ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6f4f4d6370d796a6162694f417f91c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ee61e64fece28f3c7b274edbc82bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394a9a700f080ef98249c9ccbd6cfac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e11ae6983fe8b4df081d5427ef9bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知向量
=(4,3cosα),
=(1,2tanα).
(1)若
∥
,求sinα的值;
(2)若
⊥
,且α∈(-
,0),求cos(2α+
)的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知向量
为坐标原点.
(1)当
时,求
与
的夹角的余弦值;
(2)若
三点共线,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41f2f85639241c026d4c8a1723153a0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e368f1b7109436bb94f40363544ffec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e314d99c7a237fd383f155c33e35f73c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】在直角坐标系中,
是坐标原点,向量
,其中
.
(1)若
与
的夹角为
,求
的值;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472c9e712382150f0e79610651008004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc9656d8286c4d6fa309d6ae347c89e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8337706c550bc095d7a2bd872221a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39346db456e8935d6d95a14b1d50ccde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
您最近一年使用:0次