【阅读材料】
【解答问题】
(1)你认为小明的回答正确吗?如正确,请写出证明过程,如不正确,请说明理由;
(2)若
平分
交
于点D,交射线
于点E,且
,
,
,求
的长(用含a,b的式子表示).
老师的问题: 已知:如图,在 ![]() ![]() 求作: ![]() ![]() | 小明的作法: (1)以A为圆心,适当长为半径画弧,交 ![]() ![]() (2)分别以M,N为圆心,大于 ![]() (3)作射线 ![]() ![]() ![]() |
(1)你认为小明的回答正确吗?如正确,请写出证明过程,如不正确,请说明理由;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c72942e305dfdede4b4f44c650e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0786732df29e599cd67cd69e5a1a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
更新时间:2024-02-05 16:38:36
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】同学们,我们已经学习了平行线的判定条件与相关性质,涉及同位角、内错角、同旁内角.如图①,在“三线八角”中,类比内错角,具有
与
这样位置关系的角称为“外错角”.试完成下面的探究问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/bbd22fbc-a810-4b38-aa2e-62f64ed98f59.png?resizew=345)
(1)探究定义:如图①,请另找出一对“外错角”:________.
(2)猜想判定:外错角相等,两直线平行.
如图②,
与
是直线
、
被直线
裁出的一对外错角,且
,试说明
.
(3)猜想性质:两直线平行,外错角相等.
如图②,
与
是直线
、
被直线
截出的一对外错角,且
,试说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2ec6f2e57f71267eda3e9f71f82f41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/bbd22fbc-a810-4b38-aa2e-62f64ed98f59.png?resizew=345)
(1)探究定义:如图①,请另找出一对“外错角”:________.
(2)猜想判定:外错角相等,两直线平行.
如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
(3)猜想性质:两直线平行,外错角相等.
如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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【推荐2】(1)已知:如图1,
,点
在
之间,连接
.若
,
,求
的度数.
(2)如图2,点
分别是射线
上一点,点
是线段
上一点,连接
并延长,交直线
于点
,连接
,若
,请判断直线
与
的位置关系,并说明理由;
(3)如图3,在(2)的条件下,
,
平分
,
平分
,
与
交于点
,若
,
,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384438c5fe01746c04b73701b8eb8206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16657877713a3dd26c96995183d9ea22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ed231e640aa64bc7743b2dd644f1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045bae53d43bc0755be2c01642f29c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fd42e27b3d1aacdb840ca2e0b3023a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32986401a4d24904d5e446fa9210ac6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42507b58a6b1af92b4217adbab7ef4c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407ce0683a5b001a93d5b62b6eb820c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9c1e0c3cab6b7bb3229221f4310ab0.png)
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解答题-证明题
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适中
(0.65)
【推荐1】在
中,
°,
,点
在线段
上,以
为边作正方形
,
与
的交点分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
;
(2)若点
为
的中点,求
的长;
(3)当
为等腰三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.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/19c041684b2d1b90aaca06997e471a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27763f6dcbae61e12858d1893034164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f23da5bc0c9e2acd1f120e00be7298c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437924024696832/2438629650407424/STEM/3ff2166ba7d2409699b07345ae66b96f.png?resizew=232)
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解答题-证明题
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适中
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【推荐2】实践与探究
中,点F是
上一点,点E是
的中点,
平分
.求证:
;
(2)如图2,将(1)中的“矩形
”改为“
”,结论是否成立?若成立,请证明;
(3)如图3,将(1)中的“矩形
”改为“正方形”,边长
,其它条件不变,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c36ff76f9f1ee12db562cde7a58b8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
(2)如图2,将(1)中的“矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(3)如图3,将(1)中的“矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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解答题-作图题
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适中
(0.65)
【推荐1】如图,已知点P在∠AOB内部,请你利用直尺(没有刻度)和圆规在∠AOB的角平分线上求作一点Q,使得PQ⊥OB.(不要求写作法,但要保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1573827122544640/1573827127894016/STEM/613b25d5417443a5b838f40b41a25337.png?resizew=248)
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解答题-作图题
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名校
【推荐2】利用尺规作图(保留作图痕迹,不写作法):
(1)作
的角平分线和
相交于点P;
(2)作线段
的垂直平分线和
相交于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/e47604bf-37c1-4447-8bb6-e945d4e94547.png?resizew=184)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,
,
的垂直平分线交
于点
,交
于点
,
的垂直平分线交
于点,交
于点
. 连接
.且
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720351918432256/2789553147117568/STEM/f3d1d2dc-48d1-4751-8a3d-3cabf3451f64.png)
(1)若
,则
的周长为 cm .
(2)求证:
;
(3)若去掉原题中的“
”这个条件,其他条件不变,试判断
的形状,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/e85fed22352d86bde9044473a46198e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1816fb0bed72025e79aa4b7185055ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3dac30a3d04f8c3fd7db29d5a680ea0.png)
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720351918432256/2789553147117568/STEM/f3d1d2dc-48d1-4751-8a3d-3cabf3451f64.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb36ad85a896fc35056a1305d4d4334.png)
(3)若去掉原题中的“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86c589939053ce21ce0a67cf40054a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
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解答题-问答题
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适中
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【推荐2】如图①是大家熟悉的柜式空调,关闭时叶片竖直向下.如图②,当启动时,出风口叶片会同步开始逆时针旋转到最大旋转角90°时返回,旋转速度是每秒10°,同时空调风从叶片口直线吹出.AB由5个叶片组成的出风口,经过测量,A点、B点距地面高度分别是170cm、145cm在空调正前方100cm处站着一个高70cm的小朋友(线段EF表示).
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987614752497664/2992574336049152/STEM/18239faf-e833-44ac-abe0-ca9e99dcca44.png?resizew=486)
(1)从启动开始,多长时间小朋友头顶E处感受到空调风;
(2)若叶片从闭合旋转到最大角度的过程中,小朋友的头顶E处有多长时间感受到空调风;
(3)当选择上下扫风模式时,叶片会旋转到最大角度后原速返回.从启动到第一次返回起始位的过程中,该小朋友头顶E处从第一次感受到空调风到再次感受到空调风中间间隔了多长时间.(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987614752497664/2992574336049152/STEM/18239faf-e833-44ac-abe0-ca9e99dcca44.png?resizew=486)
(1)从启动开始,多长时间小朋友头顶E处感受到空调风;
(2)若叶片从闭合旋转到最大角度的过程中,小朋友的头顶E处有多长时间感受到空调风;
(3)当选择上下扫风模式时,叶片会旋转到最大角度后原速返回.从启动到第一次返回起始位的过程中,该小朋友头顶E处从第一次感受到空调风到再次感受到空调风中间间隔了多长时间.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0494dafbea4df1d95c758ddb656afa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bccacbdde830e1329412e3e8f42ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0062f4f00732a0cf11d1ac145c218b.png)
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