如图,在
中,
,
,点
在
的延长线上,点
是边
上的一点,且存在非零实数
,使
.
(Ⅰ)求
与
的数量积;
(Ⅱ)求
与
的数量积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74864273da89d4c7771a244753ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5fc7f92372b1b3e47072dfc0a616a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b3a15ae9730962af0718c982541b85.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe35c91649a5bea2518387a2b36e0c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b62ea9f2ffb1342d9edc22e9649cad.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b96bdf51785d5d15292d6a194881ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbba7bff7720b3aa33f29936ede7819e.png)
![](https://img.xkw.com/dksih/QBM/2018/2/7/1877211848851456/1879495060717568/STEM/decbacf5e4ce42f48dc7109503e168a4.png?resizew=245)
17-18高一上·江西·期末 查看更多[2]
更新时间:2018-02-10 20:25:24
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相似题推荐
解答题-问答题
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【推荐1】在
中,
,
,以边
为一边长向外作正方体
,
为方形
的中心,
,
分别为边
,
的中点.
(1)若
,求
的长.
(2)当
变化时,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ffca492d5f4cc72de4d9d00f95a4d0.png)
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【推荐2】某公园计划改造一块四边形区域ABCD铺设草坪,其中
百米,
百米,
,
,草坪内需要规划4条人行道DM、DN、EM、EN以及两条排水沟AC、BD,其中M、N、E分别为边BC、AB、AC的中点.
,求排水沟BD的长;
(2)若
,试用
表示4条人行道的总长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c4340dcffb0783d118a587e5352a2d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解题方法
【推荐1】如图,在
中,点
满足
是线段
的中点,过点
的直线与边
分别交于点
.
,求
和
的值;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc098fa02493b905d36905c99976bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8954ac84d5a64358d2876a62f2a439b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296f25357d5576fb3ccaff55c091c95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c227da7ad9d24ae3e3740febf9f293.png)
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【推荐2】如图,已知三点
不共线,且
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb3e5531a7a10f6810f4ca44ce4d8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2df1a054-c96f-4399-b394-8114ca835308.png?resizew=183)
(1)试用
表示向量
;
(2)设线段
的中点分别为
,试证明
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae4674c96e3aeff2771fa6c67c55ceab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0304b1e39dd79ceabe3e1400824939a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb3e5531a7a10f6810f4ca44ce4d8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/2df1a054-c96f-4399-b394-8114ca835308.png?resizew=183)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d981b9af9930c2d54a3f277592c2401f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e56c57600b0e710c19a8576970e0e64.png)
(2)设线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6e1c9150976c201ad368799f70f622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c82be9793a54291a36c5d738097f745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c82be9793a54291a36c5d738097f745.png)
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解题方法
【推荐1】如图,在同一个平面内,向量
,
,
的模分别为1,1,
,
与
的夹角为
,且
,
与
的夹角为
.若
,
![](https://img.xkw.com/dksih/QBM/2020/2/19/2402333292560384/2402513104658432/STEM/736396a442474071814da6792fc0162f.png?resizew=160)
(1)求
的值;
(2)若函数
在
上的最大值为2,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc1d1b8795e1ce1fa500896959e0271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e4012993d99698492460dc66e05a26.png)
![](https://img.xkw.com/dksih/QBM/2020/2/19/2402333292560384/2402513104658432/STEM/736396a442474071814da6792fc0162f.png?resizew=160)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ae93f72e0ada681b23d377a233d792.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6cd2eab55110473285910452af73b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
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【推荐2】设
是边长为1的正三角形,点
四等分线段
(如图所示).
![](https://img.xkw.com/dksih/QBM/2015/11/24/1572302444544000/1572302450532352/STEM/53a2c96d5f37474ea4399db1adee012d.png?resizew=256)
(1)求
的值;
(2)
为线段
上一点,若
,求实数
的值;
(3)
为边
上一动点,当
取最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7807638578edd712265463a7a5eab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2015/11/24/1572302444544000/1572302450532352/STEM/53a2c96d5f37474ea4399db1adee012d.png?resizew=256)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68291343e14db2c423bf11e0db360d1b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aba947934b05caae8b0c1fb1a522a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ec4d8248cb4a457385a424190a875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3af6f75cee73a485c49e63a8b642f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c45085c7cb291380fd6611390e4bf28.png)
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解题方法
【推荐3】已知平面向量
的夹角为
,且
.
(Ⅰ)求
的最大值;
(Ⅱ)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5759a91508e6600522558561d6b67dc.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4c898afacf770646c320eabf559b7a.png)
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【推荐1】平面直角坐标系xOy中,已知向量
,
,
,且
.
(1)若已知M(1,1),N(y+1,2),y∈[0,2],则求出
的范围;
(2)若
,求四边形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c1986e1bb81eb61115a8c913f28d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa5deaf37d7c32abad8be862bebcfbaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0206a3314cf80fda9f900a00894940e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587c9e64e4e60c9697b2ca0352bf112d.png)
(1)若已知M(1,1),N(y+1,2),y∈[0,2],则求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2e4bbe53c5dfd4209387f9bc99379b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d54ad90223635fae65f444d1472854.png)
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【推荐2】如图,在△ABC的边上做匀速运动的点D,E,F,当t=0时分别从点A,B,C出发,各以定速度向点B,C,A前进,当t=1时分别到达点B,C,A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/41dff433-a926-45f5-b16f-71f94aad79a6.png?resizew=153)
(1)证明:在运动过程中,△DEF的重心保持不变;
(2)若△ABC的面积为S,求△DEF的面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/41dff433-a926-45f5-b16f-71f94aad79a6.png?resizew=153)
(1)证明:在运动过程中,△DEF的重心保持不变;
(2)若△ABC的面积为S,求△DEF的面积的最小值.
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