(1)已知
都是正数,且
,求
的最小值;
(2)设桌面上有一个由铁丝围成的封闭曲线,周长是
.回答下面的问题:
①当封闭曲线为平行四边形时,用直径为
的圆形纸片是否能完全覆盖这个平行四边形?请说明理由.
②求证:当封闭曲线是四边形时,正方形的面积最大
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
(2)设桌面上有一个由铁丝围成的封闭曲线,周长是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d916a406adac9fa4dcfbad152547ac9.png)
①当封闭曲线为平行四边形时,用直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
②求证:当封闭曲线是四边形时,正方形的面积最大
更新时间:2024-05-24 16:57:47
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】法国著名军事家拿破仑·波拿巴最早提出的一个几何定理:“以任意三角形的三条边为边向外构造三个等边三角形,则这三个等边三角形的外接圆圆心恰为等边三角形的顶点”.在
中,内角
的对边分别为
,且
,以
,
为边向外作三个等边三角形,其外接圆圆心依次为
.若
,
的面积为
,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/8b28493133d5e7cbbfa6a63bfecab966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fd4dfee3258dc4e386330bac4ef0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7736a0467e1127dc3963098e148ca64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131739cb68310e0742befae171a2d47e.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
中,内角A,B,C的对边分别为a,b,c.满足
,
,
(1)求角C;
(2)若点D与点B在AC两侧,且满足
,
,求四边形ABCD面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8607bde1fa6cde631a46e921d959a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8c2e3575ce207b3817fdef24df86c5.png)
(1)求角C;
(2)若点D与点B在AC两侧,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.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】记
的内角
,
,
的对边分别为
,
,
,已知
,
.
(1)求
的大小;
(2)
为
上一点,从下列条件①、条件②中任选一个作为已知,求线段
的最大值.
条件①:
为
的角平分线;条件②:
为边
上的中线.
![](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/fc365d7037709240df6c31f203bd4472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f002f960ec07ea229ed243e2d991d83.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
名校
解题方法
【推荐2】某品牌电脑体验店预计全年购入
台电脑,已知该品牌电脑的进价为
元/台,为节约资金决定分批购入,若每批都购入
(
为正整数)台,且每批需付运费
元,储存购入的电脑全年所付保管费与每批购入电脑的总价值(不含运费)成正比(比例系数为
),若每批购入
台,则全年需付运费和保管费
元.
(1)记全年所付运费和保管费之和为
元,求
关于
的函数.
(2)若要使全年用于支付运费和保管费的资金最少,则每批应购入电脑多少台?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01639bca9e56b3a1caf0808e06d49a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfce2106c9ad85e4965af5d95c9bf4d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cf7857e905e95b52a7f8cb6632c9a8.png)
(1)记全年所付运费和保管费之和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若要使全年用于支付运费和保管费的资金最少,则每批应购入电脑多少台?
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】在
中,角
,
,
的对边分别为
,
,
.
.
(1)求角
的大小.
(2)若
,求边
的最小值.
![](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/2c0ad389e9eb00935cb1001377503445.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7dbc702617c765a573961953cc0901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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】(1)已知x>0,求函数y=
的最小值;
(2)已知0<x<
,求y=
x(1-2x)的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f97260b0897a5a8870b4533919b846.png)
(2)已知0<x<
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.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】某社区计划在长方形空地ABCD上建一座供社区居民休闲健身的小型广场、做如下规划:在空地中的点M处修建一座凉亭,经过点M铺一条直直的小径EF,小径EF把空地分割成两块梯形区域,计划在梯形区域AEFB处修建休憩棋牌区,在梯形区域
处修建运动健身区,已知点E,F分别在AD和BC边上,
,其中
米,
米,点M到边AB的距离为30米,到边BC的距离为40米,设
米,
米.(参考数据:
)
(1)设小径
的长为
米,若
,写出
的所有可能取值组成的集合;
(2)求
的值,并求代数式
的最小值;
(3)计划在梯形区域
上,修建一个以点
为顶点,其余各顶点分别在
上的正方形耐踏草坪,设草坪的边长为
米,求函数
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10048b788ecddd1d73b853cb277fb07a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bc8d35f268b95310e7f2a3bba612cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a3debb802dd4f3e774b16ad1c154ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e223b03195218005d5c89bd004e6880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffcb0816ee2da7ddd071156a900f9eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e374298a003f568886dc459f02a41a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f85e62b60cf10d4f6a8a366f4765d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/21cf500b-f98f-4a2a-abb5-da1468d7e664.png?resizew=177)
(1)设小径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a2156cbb9b81b643fb42c853b03b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55db12bc9a3b7bd2e6decaaea6ba387e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d760204a261aae858ee3e353882899.png)
(3)计划在梯形区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4005a423bea031b020f1894aa528f00a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019bce8bf83275326a513580e329f303.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】设函数
.
(1)若不等式
的解集
,求a,b的值;
(2)若
,
,
,求
的最小值,并指出取最小值时a,b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e24ce4ead2cfe357bb8f58462f27d9a.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0af419f4bc6f089e3304a477589d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
您最近一年使用:0次