在
中,
为
的重心,过
点的直线分别交
于
两点,且
,
(1)求
的值;
(2)设
分别表示
的面积,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f2dd222ba5ac10fa1d15fae923e38.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8561b863ac580d917a628e680e47252a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14bad1aef32baef165bca0f2ca6e123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942f607354a86eeae56b9853cf8bf1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cdb4de9798f8eb5c79870a78267a53.png)
19-20高一·浙江·期末 查看更多[2]
更新时间:2020-03-05 15:46:50
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【推荐1】如图,在
中,内角
,
,
所对的边分别为
,
,
,若
,
.
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521506810863616/2522196453629952/STEM/aa99095e40f34f97af2e3a4656c3f88e.png?resizew=187)
(1)求
;
(2)若
是
边的中线,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1e18b1a23502efe74c6e57baeda8c3.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521506810863616/2522196453629952/STEM/aa99095e40f34f97af2e3a4656c3f88e.png?resizew=187)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10121e92a487622c18d90ba0925a8ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在△ABC中,AC=6,cosB=
,C=
.
(1)求AB的长;
(2)求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
(1)求AB的长;
(2)求△ABC的面积.
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【推荐1】已知在平行四边形ABCD中,
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.
(1)求点D的坐标;
(2)试判断平行四边形ABCD是否为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dab74e16403e8131f9f5b2a74f3a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da50ebd2656745259525c8b157e389e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c973a9e709cbff65f8f311e5d65ad7b4.png)
(1)求点D的坐标;
(2)试判断平行四边形ABCD是否为矩形.
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【推荐2】已知向量
,
满足
,
,且
与
不共线.
(1)若向量
与
为共线,求实数
的值;
(2)若向量
与
的夹角为
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与
的夹角.
![](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/cd18461fd9d77e6fa46a654f0ab540f8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(1)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80467aade72042974b1b2d1dbe5b3968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ebe808ac9641a9fbedd4af829368e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若向量
![](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/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8827d05338e55f9b60f882d66492ff70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
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【推荐3】已知向量
,
.
(1)当k为何值时,
与
共线;
(2)若
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且A、B、C三点共线,求实数m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172014fe535f3d3095bfc9cf9a51de6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b9c10afcf033262946f4f874455bd7.png)
(1)当k为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496590f060e41cbaca42b9eaca3cc6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697e82d288df5ac7656340301e636646.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa113fa6a474d730d41e2457ea31dae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e06541f9fb593bb1740428297f5ace.png)
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【推荐1】某企业为抓住环境治理带来的历史性机遇,决定开发生产一款大型净水设备.生产这款设备的年固定成本为
万元,每生产
台
需要另投入成本
(万元),当年产量
不足
台时,
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不少于
台时,
万元.若每台设备的售价为
万元,经过市场分析,该企业生产的净水设备能全部售完.
(1)求年利润
(万元)关于年产量
(台)的函数关系式;
(2)年产量
为多少台时,该企业在这一款净水设备的生产中获利最大?最大利润是多少万元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1654e294d4e5cca39af09908a433e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde75dfba05a0db483f205387b4ecc39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289c21d42f5cdb1ee49baf9f31e34ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5021dda43ea360fb7b1102c1a462693a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb219a71d85b5cf85eefb7fc2166f2c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
(1)求年利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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(2)年产量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】某公司决定对旗下的某商品进行一次评估,该商品原来每件售价为25元,年销售8万件.
(1)据市场调查,若价格每提高1元,销售量将相应减少2000件,要使销售的总收入不低于原收入,该商品每件定价最多为多少元?
(2)为了扩大该商品的影响力,提高年销售量.公司决定立即对该商品进行全面技术革新和销售策略调整,并提高定价到x元.公司拟投入
万元.作为技改费用,投入50万元作为固定宣传费用,投入
万元作为浮动宣传费用.试问:当该商品改革后的销售量
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