如图,在平面四边形ABCD中,AB=2,BC=3,AC=4,,BC⊥CD,E为AD的中点,AC与BE相交于点F.
(1)求△ACD的面积;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7714c3e00324c2c63e4ea6bf0d4baf.png)
22-23高一下·湖南·阶段练习 查看更多[5]
湖南省部分校2022-2023学年高一下学期第一次阶段性诊断考试数学试题辽宁省县级重点高中联合体2023届高三下学期第一次模拟考试数学试题(已下线)专题05 解三角形在几何与实际中的应用(1)-期中期末考点大串讲(已下线)重难点专题01 正弦定理与余弦定理-2022-2023学年高一数学重难点题型分类必刷题(人教B版2019必修第四册)(已下线)云南省昆明市2024届高三“三诊一模”摸底诊断测试数学试题变式题17-22
更新时间:2023-03-18 11:02:31
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解答题-证明题
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【推荐1】在
中,已知
,且
,设角
,
,
所对的边分别是
,
,
.
(1)求证:
,
,
成等差数列;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afae60880bdbef451f25e0b59fbfe41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a997c18a2361c9d2f07aadc036b8d8.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)
(1)求证:
![](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)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5864bd8a114dee93184b742b258484e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0577566dbcc526fb6f783491a4784902.png)
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解题方法
【推荐2】已知函数
在区间
上单调递增,在区间
上单调递减.如图,四边形
中,
,
,
为
的内角
,
,
的对边,且满足
.
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654879035613184/1655080581783552/STEM/3d89875fc36c4bed90cdc0292f4c0375.png?resizew=151)
(1)证明:
;
(2)若
,设
,
,
,求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6bc5be1f6650405734febefd2d25a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3629bd80b1fc9a448df6d593bc601268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebafb5475b6d5d7f56b584292e4a486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.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/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/1ce0c5748b388714acf9319ae1d12741.png)
![](https://img.xkw.com/dksih/QBM/2017/3/30/1654879035613184/1655080581783552/STEM/3d89875fc36c4bed90cdc0292f4c0375.png?resizew=151)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942245aece46d6fa4a771afe4ff05929.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05d3b8f5c9df891ef6fbcaf12f43207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e55fd3508349b15f987f6b9655b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5811e450dcff0e190c3d7378c08797c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.png)
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【推荐1】在△ABC中,
,
.
(1)若
,求
的值;
(2)在下面三个条件中选择一个作为已知,求△ABC的面积.①
;②
;③
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6a356a4332aa4733c47702b7ea112d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c08b19a6ae907d9a7a6c5e7f5f4bc1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578234ce7af604096fe0a57517c94f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
(2)在下面三个条件中选择一个作为已知,求△ABC的面积.①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba05e262093a2ac741941d223301bce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b64dcf90b6a6f24c2a4621ec49fb19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4139f94a0d9eb6ceeb41f79b072b6da.png)
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【推荐2】杭州市为迎接2023年亚运会,规划修建公路自行车比赛赛道,该赛道的平面示意图为如图所示的四边形
.运动员在公路自行车比赛中如出现故障,可以从本队的器材车、公共器材车或收容车处获得帮助,如修理或更换车轮或赛车等,也可在固定修车点处进行,还需要运送一些补给物品,例如食物、饮料、工具和配件,所以项目设计需要预留出
为赛道内的两条服务通道(不考虑宽度),
为赛道,
,
.
(1)设
点到赛道
的最短距离为
,请用
表示
的解析式;
(2)应该如何设计,才能使折线段赛道
最长(即
最大),最长值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50e7acb9445ac002b7183c02bbbc01d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82f1a784718df03bb8f6e1277acdc97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62fb2a33366b04840b54062dc2288ada.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/4436586d-c269-4560-bfcb-c9bbc613e8fa.png?resizew=155)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
(2)应该如何设计,才能使折线段赛道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6926cf539cca1f818f391aa52eeb44.png)
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【推荐1】在
中
.
(1)若
,求
的面积:
(2)在下列三个条件中选择一个作为已知,使
存在,求
.
条件①:
;条件②:
;条件③:
.
注:如果选择的条件不符合要求,第(2)问得0分:如果选择多个符合要求的条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0d7fbcc396c7b646c31f60e32d9e76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09921d9904335a83078262ce62a473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在下列三个条件中选择一个作为已知,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf7bbcc6deed520368b89c90502dab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e034d320af9316fd482fdc8a2c1e720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03dec5f11c1dcf9747edcd27a798fa56.png)
注:如果选择的条件不符合要求,第(2)问得0分:如果选择多个符合要求的条件分别解答,按第一个解答计分.
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【推荐2】已知
的角A,B,C的对边分别为a,b,c,
,
,满足
.
(1)求A;
(2)若
的面积为
,且
,点D为边BC的中点,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0784947fabac3326045c21af08bf8975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e8e3bfa498971e513adc3c185902f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cb5138a03b19266f82223899a614f7.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f911205f639d4c5523cf3a6c0fa6ad.png)
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【推荐1】设
的内角
,
,
所对应的边分别为
,
,
,已知
.
(1)求角
;
(2)若
,求
的取值范围.
![](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/710f378c17c1a1545455658e90bf3cb9.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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【推荐2】已知
分别为
三个内角
的对边,
.
(1)求
;
(2)若
,
的周长为
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](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/325d2c93b271aac8a79ab171a61b295b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa79a550591eb9e1bd07bced3a08fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb6f3d7540831a9e97d3b184a491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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