已知点C在线段
上,且
和
都是等边三角形,连接
,分别交
于点M,N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/5e8eb6f4-6ba0-4fbf-8522-f8747e0ca2f0.png?resizew=160)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e8d80f6159c7b21b9238a0696a0da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e7df43b869a50bd1bc85063763e8a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/5e8eb6f4-6ba0-4fbf-8522-f8747e0ca2f0.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd952c6cc9d03dfe75a363a66e8f61d7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd27d06065f2ddd5cf5ccbe5bef48.png)
更新时间:2024-01-24 18:44:45
|
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解答题-证明题
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【推荐1】已知:如图,AB=DE,A=D,AC=DF.求证:AC∥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/0897fa47-ba8f-4b96-ab93-7667bd0d36ab.png?resizew=185)
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解答题-证明题
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【推荐2】已知△ABC和△ADE均为等腰三角形,且∠BAC=∠DAE,AB=AC,AD=AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/11/5b87af9a-f6d4-4cba-8627-2d6cce3fbaa8.png?resizew=295)
(1)如图1,点E在BC上,求证:BC=BD+BE;
(2)如图2,点E在CB的延长线上,(1)的结论是否成立?若成立,给出证明;若不成立,写出成立的式子并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/11/5b87af9a-f6d4-4cba-8627-2d6cce3fbaa8.png?resizew=295)
(1)如图1,点E在BC上,求证:BC=BD+BE;
(2)如图2,点E在CB的延长线上,(1)的结论是否成立?若成立,给出证明;若不成立,写出成立的式子并证明.
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解答题-证明题
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【推荐1】如图,在△ABC中,AC=BC,∠ACB=90°,延长CA至点D,延长CB至点E,使AD=BE,连接AE,BD,交点为O.
(1)求证:OB=OA;
(2)连接OC,若AC=OC,则∠D的度数是 度.
(1)求证:OB=OA;
(2)连接OC,若AC=OC,则∠D的度数是 度.
![](https://img.xkw.com/dksih/QBM/2021/2/23/2664376279973888/2671423319531520/STEM/13459069-1b26-44dc-9b15-9c68e1d10cae.png)
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解答题-证明题
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真题
名校
【推荐2】(1)如图1,在正方形ABCD中,E是AB上一点,F是AD延长线上一点,且DF=BE,求证:CE=CF;
(2)如图2,在正方形ABCD中,E是AB上一点,G是AD上一点,如果∠GCE=45°,请你利用(1)的结论证明:GE=BE+GD;
(3)运用(1)(2)解答中所积累的经验和知识,完成下题:
如图3,在直角梯形ABCD中,AD∥BC(BC>AD),∠B=90°,AB=BC,E是AB上一点,且∠DCE=45°,BE=4,DE=10, 求直角梯形ABCD的面积.
(2)如图2,在正方形ABCD中,E是AB上一点,G是AD上一点,如果∠GCE=45°,请你利用(1)的结论证明:GE=BE+GD;
(3)运用(1)(2)解答中所积累的经验和知识,完成下题:
如图3,在直角梯形ABCD中,AD∥BC(BC>AD),∠B=90°,AB=BC,E是AB上一点,且∠DCE=45°,BE=4,DE=10, 求直角梯形ABCD的面积.
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,
为等边三角形.
求作:菱形
,使得
.
作法:如图,
①作
的平分线
,交
于点D;
②以点A为圆心,
长为半径画弧交
的延长线于点E;
③分别以点B,E为圆心,
长为半径画弧,两弧交于点F(不是点A);
④连接
.
则四边形
为所求作的菱形.
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:∵
,
∴四边形
为菱形(______)(填推理依据).
∵
为等边三角形,∴
.
∵
平分
,∴
______
.
∵
,∴
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求作:菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a05312797f53571fb99d8e0f9e1075.png)
作法:如图,
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
③分别以点B,E为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5912e3dd19cd8024dfb950bad0358a11.png)
则四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/ee0d155f-b56a-496e-9261-7eccafb05f21.png?resizew=164)
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d59410a590b4053f859f3d4732ca71b.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b495182bfde8f866fae490fdf0000393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee06e20972dffda43fd35f37953b2c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4af17b55fa474f0103a858c2604b093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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解答题-问答题
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【推荐2】如图,矩形
的四个顶点在正
的边上,已知正
的边长为2,记矩形
的面积为
,边长
为
.
![](https://img.xkw.com/dksih/QBM/2020/6/13/2484008553250816/2491754556850176/STEM/ddbf4402-7402-4b74-bb9e-3f7e5fc4c7b2.png)
求:(1)
关于
的函数表达式和自变量
的取值范围;
(2)当
时,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2020/6/13/2484008553250816/2491754556850176/STEM/ddbf4402-7402-4b74-bb9e-3f7e5fc4c7b2.png)
求:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9384e9035d86d3cf2e5c8b6966f29de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐3】【新知学习】如果一个三角形有一边上的中线等于这条边的一半 ,那么我们就把这样的三角形叫做“智慧三角形”.
【简单运用】下列三个三角形,是智慧三角形的是_______(填序号);
【深入探究】如图,在正方形
中,
,点E是
的中点,F是
上一点,且
,试判断
是否为“智慧三角形”,并说明理由;
【灵活应用】如图,等边三角形
边长
.若动点P以
的速度从点A出发,沿
的边![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd38fc67ed5c88c02ee6b45174fb143.png)
运动.若另一动点Q以
的速度从点B出发,沿边
运动,两点同时出发,当点Q首次回到点B时,两点同时停止运动.设运动时间为
,那么t为_______
时,
为“智慧三角形”.
【简单运用】下列三个三角形,是智慧三角形的是_______(填序号);
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/39d5c5d9-c2a1-48c8-b47e-d69b8d031182.png?resizew=346)
【深入探究】如图,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da37579f60ddb7078d91091b64194fa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c1441979b0a396730e612eb9ac408c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/3ccc6b9b-ce8b-432b-a3e0-3a4a0ab6e41e.png?resizew=134)
【灵活应用】如图,等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd38fc67ed5c88c02ee6b45174fb143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e8503959de9bcffd08d7da0ffea8a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1ea73e03656e74be8cd6f6241cb7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658a4628220e7ef54824f10dc98d56d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/0c9fb598-c8c7-4ca4-918e-723946e7b87b.png?resizew=133)
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