数学课上,何老师提出如下的问题:
如图
,在等边
中,点
在边
上,点
在边
的延长线上,且
,试确定
的形状,并说明理由;
如图
,过点
作
,交
于点
,先证
是等边三角形,再证得
,从而得出
是等腰三角形.
完成下面问题:
(1)上述思路证明
的依据是_________;
(2)聪明的小智同学想到另一种不同的思路:过点
作
交
于点
.请沿着小智同学的思路,求证:
是等腰三角形;
(3)在边长为
的等边
中,点
在直线
上运动,点
在直线
上运动,当
,且
是等腰三角形时,请直接写出
的长.
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfdadd6f7bf825732dd8833d5d194d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f3624ae3a3de32f0054f36d653106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/63bb3c84-ab30-43ec-85f3-594629b7ff3e.png?resizew=286)
完成下面问题:
(1)上述思路证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f3624ae3a3de32f0054f36d653106.png)
(2)聪明的小智同学想到另一种不同的思路:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
(3)在边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5cd2dbaf41ad27150361f73da76bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2024-04-09 13:42:14
|
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在矩形
中,点
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是
的外接圆,
交边
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;
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-证明题
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适中
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【推荐2】证明命题“一组对边平行且相等的四边形是平行四边形”,要根据题意,画出图形,并用几何符号表示已知和求证.写出证明过程,下面是小文根据题意画出的图形,并写出了不完整的已知和求证.
已知:如图,在四边形ABCD中,AB//CD, .
求证: .
请补全已知和求证部分,并写出证明过程.
已知:如图,在四边形ABCD中,AB//CD, .
求证: .
请补全已知和求证部分,并写出证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/ba74951c-beee-4890-867d-7f47085e088b.png?resizew=204)
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解答题-证明题
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适中
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【推荐1】如图,
,
是
上一点,
平分
且过
的中点
,交
于点
,
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/9/24/2556792397561856/2556893161357312/STEM/26f3bf4b09c843d6aa3228e0dd6af89d.png?resizew=207)
(1)求证四边形
是菱形;
(2)若
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b751d36120a1efa42b2f185572397b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-作图题
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适中
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【推荐2】如图,在平行四边形
中,点E是
边的中点,请仅利用无刻度的直尺作图,保留作图痕迹,不写画法.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/2d56ccf9-bc8e-43d5-be46-e7e68c1eb0fd.png?resizew=216)
请从下面A,B两题中任选一题作答.我选择 题.
A.在
边上找一点P,使点P是
的中点,并说明理由.
B.在
的延长线上找一点F, 使
的面积与平行四边形
的面积相等,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/2d56ccf9-bc8e-43d5-be46-e7e68c1eb0fd.png?resizew=216)
请从下面A,B两题中任选一题作答.我选择 题.
A.在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
B.在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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解答题-作图题
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名校
【推荐1】对于平面直角坐标系
中的线段
及点Q,给出如下定义:若点Q满足
,则称点Q为线段
的“中垂点”;当
时,称点Q线段
的“完美中垂点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/fa9bf999-73a6-49e5-b911-7c272eb90632.png?resizew=566)
(1)如图1,
,下列各点中,线段
的中垂点是_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696fa67dd6a202fb1a7af55aa27577ad.png)
(2)如图2,点A为x轴上一点,若
为线段
的“完美中垂点”,写出线段
的两个“完美中垂点”是__________和__________.
(3)如图3,若点A为x轴正半轴上一点,点Q为线段
的“完美中垂点”,点
在y轴正半轴上.
①请用尺规作图在线段
上方做出线段
的“完美中垂点”M
②求
(用含m的式子表示)及
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/fa9bf999-73a6-49e5-b911-7c272eb90632.png?resizew=566)
(1)如图1,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696fa67dd6a202fb1a7af55aa27577ad.png)
(2)如图2,点A为x轴上一点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ad849af41b82a1c9d3eccd957e6c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
(3)如图3,若点A为x轴正半轴上一点,点Q为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bdb666d09b92d3c6e87e00e5790a88.png)
①请用尺规作图在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图
,分别是可活动的菱形和平行四边形学具.已知平行四边形较短的边的长度与菱形的边长相等.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/c67142a3-518e-4779-8ec5-8afbac9db02c.png?resizew=357)
(1)将菱形的一边与平行四边形的较短边重合,摆拼成如图
所示的图形,
经过点
,连接
交
于点
.求证:点
是
的中点;
(2)如图
,在(1)的条件下,当
时,延长
,
交于点
,请探究
,
之间的数量关系,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/c67142a3-518e-4779-8ec5-8afbac9db02c.png?resizew=357)
(1)将菱形的一边与平行四边形的较短边重合,摆拼成如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c89f9fb5d1a84be8aee78dca23090d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐1】如图,在平行四边形ABCD中,AC是对角线,BE⊥AC,DF⊥AC,垂足分别为点E,F.
(2)若AE=1,EF=2,BE=3,求BC的长.
(2)若AE=1,EF=2,BE=3,求BC的长.
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解答题-证明题
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【推荐2】〖探究〗如图①,分别以△ABC的两边AB和AC为边向△ABC外作正三角形ABD和正三角形ACE,连接DC、BE.求证:DC=BE.
〖拓展〗如图②,在四边形ABCD中,AB=BC=5,∠ABC=45°,连接AC、BD.若∠DAC=90°,AC=AD,则BD的长为_____.
〖拓展〗如图②,在四边形ABCD中,AB=BC=5,∠ABC=45°,连接AC、BD.若∠DAC=90°,AC=AD,则BD的长为_____.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/9f3edd28-5449-41cd-bea4-9ec3cef720b0.png?resizew=349)
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