如图,在平面直角坐标系中,点
且
、
满足
,过点
作AB⊥x轴于
,过点
作AC⊥y轴于
点,点
,
分别是直线
,x轴的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/bdb5eda6-1bd6-4fa7-a5d0-f37dee119ecc.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/4229ba41-9902-4b78-9ef7-666c5c6ed3e4.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/9fa17ac4-62c1-46e6-a093-e87c4826818d.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/1f251dd8-43b6-4b7a-b31f-7c5f009d0229.png?resizew=134)
(1)如图1,点
,
分别在线段
,
上,若
,求证:
;
(2)如图2,连接
,∠ECF=45°,
①求证:
;
②若△
的面积为4,求线段
的长度;
(3)已知,点
,
分别在线段
和
的延长线上,连接
.
①如图3,已知
,CF⊥EF,线段
上存在一点
,使得
,求点
的坐标;
②在(2)的条件下,如图4,请直接写出线段
,
和
之间的数量关系以及点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7903097d9663549d86e6267da59537a2.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/9673443b5c8ff3608e94ebfd30b5b4c8.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/bdb5eda6-1bd6-4fa7-a5d0-f37dee119ecc.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/4229ba41-9902-4b78-9ef7-666c5c6ed3e4.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/9fa17ac4-62c1-46e6-a093-e87c4826818d.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/1f251dd8-43b6-4b7a-b31f-7c5f009d0229.png?resizew=134)
(1)如图1,点
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f841299efc59a7f12218862f6fb859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa08acad49fe3d3703c0cfd59f8b5ab4.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b620d6178aa479d75e9a2cab35607635.png)
②若△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)已知,点
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
①如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25f1ccb3e56af0073e9b13f2039dee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818aefd22d6953be0f42c9c6b071e06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②在(2)的条件下,如图4,请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2022-10-11 09:11:23
|
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解答题-问答题
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适中
(0.65)
【推荐1】在平面直角坐标系中,A(a,0),B(b,0),C(﹣1,c)(见图1),且 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9789f0cb423e7153036b6844cc1d8ba0.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/c0db2d0c-aa54-4d38-9a35-86418e9723e2.png?resizew=345)
(1)求a、b、c的值;
(2)①在x轴的正半轴上存在一点M,使三角形COM的面积是三角形ABC的面积的一半,求出点M的坐标;
②在坐标轴的其它位置是否存在点M,使三角形COM的面积三角形ABC的面积的一半仍然成立? 若存在,请直接写出符合条件的点M的坐标;
(3)如图2,过点C作CD⊥y轴交y轴于点D,点P为线段CD延长线上的一动点,连接OP,OE平分∠AOP,OF⊥OE.当点P运动时,
的值是否会改变?若不变,求其值;若改变,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9789f0cb423e7153036b6844cc1d8ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207883fe04bf668ee10e8d1b316ed7b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/c0db2d0c-aa54-4d38-9a35-86418e9723e2.png?resizew=345)
(1)求a、b、c的值;
(2)①在x轴的正半轴上存在一点M,使三角形COM的面积是三角形ABC的面积的一半,求出点M的坐标;
②在坐标轴的其它位置是否存在点M,使三角形COM的面积三角形ABC的面积的一半仍然成立? 若存在,请直接写出符合条件的点M的坐标;
(3)如图2,过点C作CD⊥y轴交y轴于点D,点P为线段CD延长线上的一动点,连接OP,OE平分∠AOP,OF⊥OE.当点P运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f2a7ebf0bb96fbe9fc9dabb63a8c12.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知a,b,c都是实数,且满足
,且
,求代数式
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be987f872ba113c37695d5fd133bb86b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b9234129e4471ead40213a75a50021.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】在平面直角坐标系中描出点
.
先用线段依次连接点O,A,B,C,D,然后再用线段连接A,C两点.
(1)你得到了一个什么图形?
(2)填写表1,在平面直角坐标系中描出点
,并按同样的方式连接各点.这样得到的图形与(1)中的图形相比有什么变化?
(3)如果把表1换成表2呢?
表1:
表2:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b5af39b2f40d44c83551a8ae622a10.png)
先用线段依次连接点O,A,B,C,D,然后再用线段连接A,C两点.
(1)你得到了一个什么图形?
(2)填写表1,在平面直角坐标系中描出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9152fc5922eb5c8cbddbaed87cd26dea.png)
(3)如果把表1换成表2呢?
表1:
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
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解答题-问答题
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适中
(0.65)
【推荐2】【观察发现】如图,一些点按照一定的规律排列:点
,点
,点
,点
,点
,…
(1)直接写出:点
的坐标为______;点
的坐标为______.
(2)用含
(
为正整数)的代数式表示点
的坐标为______,点
的坐标为______.
(3)在(2)的条件下,若点的坐标为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c7f93ae305d67cf31b751e768ae48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8983ad764a160aeb0b8193697294b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66c353b6b9186af33a36240be6c52f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df56df0ee7e39607577ad8bf0e4d6bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8f228e3bf85fe972e99c73b1ac5597.png)
(1)直接写出:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd23f3dd69b74faf3894ae4906491e72.png)
(2)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a29fef95ed54dcf5c653749f5e9d232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925be8927ea9b4f42bf9519eb8c55405.png)
(3)在(2)的条件下,若点的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8ff26ee9eee641d847ee57bf140152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-证明题
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名校
【推荐2】已知:如图,在□ABCD中,点E、F是对角线AC上的两点,且AE=CF.求证:BF∥DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/27315f0b-40b6-4c93-b130-bb0ee0c66250.png?resizew=176)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图①,∠BAD=90°,AB=AD,过点B作BC⊥AC于点C,过点D作DE⊥CA的延长线点E,由∠1+∠2=∠D+∠2=90°,得∠1=∠D,又∠ACB=∠AED=90°,AB=AD,得△ABC≌△DAE进而得到AC=DE,BC=AE, 我们把这个数学模型称为“K字”模型或“一线三等角”模型.
请应用上述“一线三等角”模型,解决下列问题:
(1)如图②,∠BAD=∠CAE=90°,AB=AD,AC=AE,连接BC、DE,且BC⊥AH于点H,DE与直线AH交于点G,求证:点G是DE的中点.
(2)如图③,在平面直角坐标系中,点A为平面内任意一点,点B的坐标为(4,1),若△AOB是以OB为斜边的等腰直角三角形,请直接写出点A的坐标.
请应用上述“一线三等角”模型,解决下列问题:
(1)如图②,∠BAD=∠CAE=90°,AB=AD,AC=AE,连接BC、DE,且BC⊥AH于点H,DE与直线AH交于点G,求证:点G是DE的中点.
(2)如图③,在平面直角坐标系中,点A为平面内任意一点,点B的坐标为(4,1),若△AOB是以OB为斜边的等腰直角三角形,请直接写出点A的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/40779f44-c782-4f4a-b32e-69789dd8152f.png?resizew=463)
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