在▱
中,已知
,
,
是
边上的任意一点,过
点作
,交
边于
,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/0253cd47-49ca-4fdd-8942-953ce51e41ca.png?resizew=201)
(1)若
时,试求出
的
边上的高;
(2)当
的长为多少时,
的面积最大,并求出面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefabaea26d1d196c489e45e2e29ab46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/0253cd47-49ca-4fdd-8942-953ce51e41ca.png?resizew=201)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e713f0ba80e87438cf6273fb00cb81a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9596850884048064a3ec8bd48c4762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef0db813a64ec6caa9373413dbf822d.png)
更新时间:2023-02-04 12:53:45
|
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【推荐1】如图,某中学准备在校园里利用围墙的一段,再砌三面墙,围成一个矩形花园ABCD(围墙MN最长可利用25m),现在已备足可以砌50m长的墙的材料.
(1)设计一种砌法,使矩形花园的面积为300m2.
(2)当BC为何值时,矩形ABCD的面积有最大值?并求出最大值.
(1)设计一种砌法,使矩形花园的面积为300m2.
(2)当BC为何值时,矩形ABCD的面积有最大值?并求出最大值.
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【推荐2】已知在平面直角坐标系
中,二次函数
的图像与
轴相交于点
和点
(点
在点
的左边),与
轴相交于点
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c35ab0cd0a8c56de7399e4209aaf82d.png)
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名校
【推荐1】如图1,已知等边
边长为
,点P、Q分别是边
上的动点,点P、Q分别从点A、B同时出发,且它们的速度都为
.连接
交于点M.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3662cf0fb1c007863b22a939b3c0d73.png)
;
(2)连接
,何时
是直角三角形?
(3)如图2,若点P、Q在运动到终点后继续在射线
上运动,直线
交于点M,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd3724385f98a2415ba27f8df4c31d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e2fb464db23db47817a91ba1764f16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/d50b101e-e21b-423d-9894-1c419d181c86.png?resizew=333)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3662cf0fb1c007863b22a939b3c0d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b13964019381c4cd9de05f95c4261b.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
(3)如图2,若点P、Q在运动到终点后继续在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd3724385f98a2415ba27f8df4c31d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e2fb464db23db47817a91ba1764f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9baba5742fe32111ddd8a76fd5b265.png)
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【推荐2】如图1,在△ABC中,∠B=60°,点M从点B出发沿射线BC方向,在射线BC上运动.在点M运动的过程中,连结AM,并以AM为边在射线BC上方,作等边△AMN,连结CN.
(1)当∠BAM= °时,AB=2BM;
(2)请添加一个条件: ,使得△ABC为等边三角形;
①如图1,当△ABC为等边三角形时,求证:CN+CM=AC;
②如图2,当点M运动到线段BC之外(即点M在线段BC的延长线上时),其它条件不变(△ABC仍为等边三角形),请写出此时线段CN、CM、AC满足的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/06bc6594-cb62-4451-a09b-59e8291865e6.png?resizew=415)
(1)当∠BAM= °时,AB=2BM;
(2)请添加一个条件: ,使得△ABC为等边三角形;
①如图1,当△ABC为等边三角形时,求证:CN+CM=AC;
②如图2,当点M运动到线段BC之外(即点M在线段BC的延长线上时),其它条件不变(△ABC仍为等边三角形),请写出此时线段CN、CM、AC满足的数量关系,并证明.
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【推荐1】如图所示,一座圆弧形拱桥的跨度AB长为40米,桥离水面最大距离CD为10米,若有一条水面上宽度为30米,宽度为6米的船能否通过这座桥?请说明理由.
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解答题-证明题
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【推荐2】如图,
为圆
的内接三角形,
,连接
并延长交
于点
.
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/e51225c2-a089-45ff-b130-15ab8fb6ea91.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
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【推荐1】
,AB=15,CD=10,AD=3,CB=4,求
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【推荐2】如图,在平行四边形
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