如图1,在
中,
点D在
的延长线上,且
,分别过点D作
交
的延长线于点E,连接
,交
于点G,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/7149d23e-6471-4401-815a-ee2d16bbbf20.png?resizew=427)
(1)求
的长,并证明
;
(2)如图1,在射线
上只用圆规作一点Q,使得
(保留作图痕迹,并简要说明作法);
(3)如图2,在(2)的条件下,连接
,分别取
的中点M、N,动点H在
上运动,求
的最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e63c75a09970f9c30729b0ff52f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/7149d23e-6471-4401-815a-ee2d16bbbf20.png?resizew=427)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f066d6bfd7c9d0230d78c92c0263e2.png)
(2)如图1,在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fd463735041b9b58048f1e58af55d5.png)
(3)如图2,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e783a26082a6288150f8e706ab72e885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56c85df688c22131ef2ab5d745fc30a.png)
更新时间:2023-03-13 13:05:32
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解答题-证明题
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【推荐1】如图,四边形ABCD是矩形,点E在AD边上,点F在AD的延长线上,且BE=CF.
(1)求证:四边形EBCF是平行四边形.
(2)若∠BEC=90°,∠ABE=30°,AB=
,求ED的长.
(1)求证:四边形EBCF是平行四边形.
(2)若∠BEC=90°,∠ABE=30°,AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2017/12/3/1830627567468544/1831424450494464/STEM/10699e871f7447d1bce3930523dec3c3.png?resizew=209)
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【推荐2】如图,在
中,
,
,
,点
从点
出发,以每秒
个单位长度的速度沿折线
运动.设点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/742fd0c7-4c08-41fd-a3fe-b968507ffa9c.png?resizew=296)
(1)求斜边
上的高线长;
(2)
当
在
上时,
的长为__________,
的取值范围是__________.(用含
的代数式表示);
若点
在
的角平分线上,则
的值为__________;
(3)在整个运动过程中,当
是等腰三角形时
的值为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6f3d14d4c0d628472a0b5dbd603f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d4eea2b5e11dfe32542187de16af12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49f153ca324c9fd5fd0247b1f6e9fa53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a33482b5c998fe8741c0a6ce12ad73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/742fd0c7-4c08-41fd-a3fe-b968507ffa9c.png?resizew=296)
(1)求斜边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在整个运动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】如图,在
中,
,
,
,
为
中点,点
分别在直线
上,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/52b678ea-afca-49e2-95ba-a1720e8f2a68.png?resizew=350)
(1)当点
与点
重合时,求
的长;
(2)当点
不与点
重合时,求证:
;
(3)若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](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/0ce9b6bb1f3e46026af863b2b269ecf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dfc2edd439281ad211a3736f9484a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/52b678ea-afca-49e2-95ba-a1720e8f2a68.png?resizew=350)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5040e620581e11dd2af83caa6623f1f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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名校
【推荐2】(1)如图④,直线l与
相切于点A,B是l上一点,连接
,C是
上一点.若
的半径r是
与
的比例中项,请用直尺和圆规作出点 C.(保留作图痕迹,不写作法)
(2)如图⑤,A是
外一点,以
为直径的
交
于点B、C,
与
交于点D,E为直线
上一点(点E不与点B、C、D重合),作直线
,与
交于点F,若
的半径是r,求证:r是
与
的比例中项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)如图⑤,A是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817b898a4106c0fc24edee630a9eed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817b898a4106c0fc24edee630a9eed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8c61379221cb1cb7779cee73d5dfd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8c61379221cb1cb7779cee73d5dfd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9822ecc503ff52b678888a7087ae410a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/663512e5-2b93-49c5-91e6-2d9f8036508e.png?resizew=227)
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【推荐1】如图①,在平面直角坐标系中,已知A(6,6)、B(12,0)、M(3,0),∠MAN=45°.
(1)判断△AOB的形状为______;
(2)求线段AN的长;
(3)如图②,若C(-3,O),在y轴的负半轴上是否存在一点P,使∠NPO=2∠CPO?若存在,求点P的坐标;若不存在,请说明理由.
(1)判断△AOB的形状为______;
(2)求线段AN的长;
(3)如图②,若C(-3,O),在y轴的负半轴上是否存在一点P,使∠NPO=2∠CPO?若存在,求点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/16/2226697239166976/2228923589861376/STEM/e06d0d71a149405480d0190c98612bab.png?resizew=306)
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【推荐2】综合与探究
【问题背景】北师大版数学八年级下册
第12題(以下图片框内).
【初步探究】
(1)我们需利用图形的旋转与图形全等的联系,并把特殊角度一般化.如图1,在
与
中,
,
,
.求证:
.
(2)如图2,在边长为3的正方形
中,点
,
分别是
,
上的点,且
.连接
,
,
,若
,求
的长.
【拓展应用】
(3)如图3,在四边形
中,
,
,
,
,
,请直接写出
的长.
【问题背景】北师大版数学八年级下册
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0558942aedbcf1027957b7f0339a72.png)
如图,![]() ![]() ![]() ![]() ![]()
|
(1)我们需利用图形的旋转与图形全等的联系,并把特殊角度一般化.如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)如图2,在边长为3的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
【拓展应用】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40f21ed433e6e98084953473805dd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐3】【阅读材料】在某次数学兴趣小组活动中,小明同学遇到了如下问题:如图1,在等边△ABC中,点P在内部,且PA=3,PC=4,∠APC=150°,求PB的长.经过同学们的观察、分析、思考、交流,对上述问题形成了如下想法:将△APC绕点A按顺时针方向旋转60°,得到△ABD,连接PD,寻找PA、PB、PC三边之间的数量关系.即能求PB= 请参考他们的想法,完成下面问题:
【学以致用】如图2,在等腰直角△ABC中,∠ACB=90°,P为△ABC内一点,PA=5,PC=2
,∠BPC=135°,求PB的长;
【能力拓展】如图3,等腰三角形ABC中,∠ACB=120°,D、E是底边AB上的两点且∠DCE=60°,若AD=2,BE=3,求DE的长.
【学以致用】如图2,在等腰直角△ABC中,∠ACB=90°,P为△ABC内一点,PA=5,PC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
【能力拓展】如图3,等腰三角形ABC中,∠ACB=120°,D、E是底边AB上的两点且∠DCE=60°,若AD=2,BE=3,求DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/15f807dc-5a30-4261-9a94-3ef799705aff.png?resizew=551)
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【推荐1】【教材呈现】华师版教材九年级上册
₇页
题.已知:如图①,在
中,
,点
、
、
分别为
、
、
的中点.求证:四边形
是菱形.
(1)如图②,在
中,
是
的角平分线,
交
延长线于点
,点
为
的中点,连结
.若
,
,则
_______.
(2)如图③,在
和
中,
,
,连结
,点
、
、
分别为
、
、
的中点.若
,
,
,则
的最小值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78c013cb4fc61193b651072d5e15de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b78d48bd70b977715edc09b1ca98a1.png)
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02657893409206d945c5f41fc6b363f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
(2)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209177a9ad66cbd98b451df005d5e9c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc18a609bf45b99076774ca577a168b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14aec46de991e6f8503d5f94bc00b33d.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
真题
【推荐2】已知:△ABC和△ADE均为等边三角形,连接BE,CD,点F,G,H分别为DE,BE,CD中点.
(2)在△ADE旋转的过程中,当B,D,E三点共线时,如图2,若AB=3,AD=2,求线段FH的长;
(3)在△ADE旋转的过程中,若AB=a,AD=b(a>b>0),则△FGH的周长是否存在最大值和最小值,若存在,直接写出最大值和最小值;若不存在,说明理由.
(2)在△ADE旋转的过程中,当B,D,E三点共线时,如图2,若AB=3,AD=2,求线段FH的长;
(3)在△ADE旋转的过程中,若AB=a,AD=b(a>b>0),则△FGH的周长是否存在最大值和最小值,若存在,直接写出最大值和最小值;若不存在,说明理由.
您最近一年使用:0次