已知:如图1,△ABC中,∠ACB=90°,CD⊥AB于D,E为BC中点,CF⊥AE于F.
(1)求证:4CE2=BD•AB;
(2)若2∠DCF=∠ECF,求cos∠ECF的值;
(3)如图2,DF延长线交BC于G,若AC=BC,EG=1,则DG= .
(1)求证:4CE2=BD•AB;
(2)若2∠DCF=∠ECF,求cos∠ECF的值;
(3)如图2,DF延长线交BC于G,若AC=BC,EG=1,则DG= .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/f7c78e01-20f1-4d53-8753-417d777454cc.png?resizew=309)
2019·湖北武汉·三模 查看更多[1]
更新时间:2020-02-28 22:30:51
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解答题-计算题
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解题方法
【推荐1】问题探究
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/01105f60-1d89-4cb2-b48b-b554d1b63bab.png?resizew=384)
(1)如图1,
直线
,点
在
上,点
、
在直线
上,连接
、
,请利用直尺在射线
上找一点
,使得
;
(2)如图2,在菱形
中,
,
,
为线段
延长线上一点,连接
、
,点
到
的距离为
,求
的长;
问题提出
(3)如图3,有一个四边形板材
,
,
.现李师傅要从这块板材中裁出一个部件,他先在四边形
上画了一个正方形
,点
在
上,在
上截取
,连接
,
即为所要裁的部件.测出
、
之间的距离为
,
,请你帮助李师傅计算出所裁部件
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/01105f60-1d89-4cb2-b48b-b554d1b63bab.png?resizew=384)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8099c774a6ae6dd98712b0b90b60cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97abae008a78887a7d2002aebeac81fa.png)
(2)如图2,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a03e0d9ec888c1c343853295c40318b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
问题提出
(3)如图3,有一个四边形板材
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11734fc004661239bae96e4915da4cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7755a9b7ac48345bcfbb9eba283867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71a41641aa0d0e45a3c03d3d2c1196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab0412a0d270a54a68eca6fe140770b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】在△ABC中,∠B=45°,∠C=30°,点D是BC上一点,连接AD,过点A作AG⊥AD,在AG上取点F,连接DF.延长DA至E,使AE=AF,连接EG,DG,且GE=DF.
(1)若AB=2
,求BC的长;
(2)如图1,当点G在AC上时,求证:BD=
CG;
(3)如图2,当点G在AC的垂直平分线上时,直接写出
的值.
(1)若AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)如图1,当点G在AC上时,求证:BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)如图2,当点G在AC的垂直平分线上时,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423bf3651b4e2dea4b4fe7b938c2bb84.png)
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【推荐3】如图,在平面直角坐标系中,直线
与x轴、y轴分别交于点B、C,直线AC交x轴负半轴于点A,
.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2928735273074688/2935928031821824/STEM/d5bd498c09dc40daa3b64bf0723114b5.png?resizew=493)
(1)如图1,求直线AC的解析式;
(2)如图2,点M是线段AO上一点(点M不与点A、O重合),过点M作x轴的垂线交AC于点N,过点N作x轴的平行线交BC于点G,设线段NG的长为d,点M的横坐标为t,求d与t之间的函数解析式;
(3)如图3,在(2)的条件下,点D是第四象限内射线CB上一点,连接OD,过点O作OE⊥OD交线段BC于点E,在射线OE上截取
,连接FD交射线OG于点H,若
,
,求点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad9e91966c563d3766e7a0f1f04ddd8.png)
![](https://img.xkw.com/dksih/QBM/2022/3/4/2928735273074688/2935928031821824/STEM/d5bd498c09dc40daa3b64bf0723114b5.png?resizew=493)
(1)如图1,求直线AC的解析式;
(2)如图2,点M是线段AO上一点(点M不与点A、O重合),过点M作x轴的垂线交AC于点N,过点N作x轴的平行线交BC于点G,设线段NG的长为d,点M的横坐标为t,求d与t之间的函数解析式;
(3)如图3,在(2)的条件下,点D是第四象限内射线CB上一点,连接OD,过点O作OE⊥OD交线段BC于点E,在射线OE上截取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3dd7186896bd760b830a905cf9fec6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914beae5191e2532c98d18bbacbcccb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397beeea02c7cde04307e7d1e9cb45dd.png)
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【推荐1】(1)问题发现
和
均为等边三角形,点
,
,
在同一直线上,连接
.
①线段
,
之间的数量关系为 ;
②
的度数为 ;
(2)拓展探究
如图2,
和
均为等腰直角三角形,
,点
,
,
在同一直线上,连接
,求
的值及
的度数;
(3)解决问题
如图3,在正方形
中,
,若点
满足
,且
,请直接写出点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)拓展探究
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9776aa108071b50b71adf181bbdaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
(3)解决问题
如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fbdef9d23784b3d2c6dda57634e442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7a201432af0a2f9d21c6803906f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d5974e8669eb588401203de18a3ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】如图,在直角坐标平面内,函数
(
,
是常数)的图象经过
,
,其中
.过点
作
轴垂线,垂足为
,过点
作
轴垂线,垂足为
,连结
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/ae2281a1-ad53-4f4a-a07d-7bcce9778059.png?resizew=167)
(1)若
的面积为4,求点
的坐标;
(2)求证:
;
(3)当
时,求直线
的函数解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71a512987761644b8d7fac755fd89c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcd735ddc790c918d9a93336093fb02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/ae2281a1-ad53-4f4a-a07d-7bcce9778059.png?resizew=167)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe2f6543e06a25493855fbbc648be6d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】如图,在矩形
中
,
动点P从点D以每秒各4单位的速度向终点C运动,与此同时动点Q从点C出发以每秒各5单位的速度向终点A运动,射线
交折线
于点E,作点C关于直线
的对称点
;分别连结
,
,
,设点P的运动时间为
.
;
(2)当点E与点B重合时,求t的值;
(3)当点E在线段
上且
是等腰三角形时,求t的值.
(4)当
时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc0d8c4e945e4230252a7b4c97d39ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ccb3ef28c97cc8fbc6fcb4d21db87f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702518d070e667c54087eebed9c410b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83ccde054ec5f3473ede6c07e484290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae3da6eef717d2d0fb773ce2e1f0a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702518d070e667c54087eebed9c410b7.png)
(2)当点E与点B重合时,求t的值;
(3)当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86643348a8164750d9aefcfe20fecb7c.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4cf0eb66cdcff113db9e2a4515cdeed.png)
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【推荐2】如图1,已知E为正方形ABCD形外一点,且∠E=45°,过点A作AF⊥CE,垂足为F,连接AC.
![](https://img.xkw.com/dksih/QBM/2022/3/20/2946666806681600/2950845848518656/STEM/8c137a47-cf56-461b-9187-49de658e1751.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2022/3/20/2946666806681600/2950845848518656/STEM/6fa9275c-a6f7-43b8-87f9-0340fc8fe883.png?resizew=171)
(1)请找出图中与△ACE相似的三角形,并说明理由.
(2)以BC为直径作半圆交BF于点P(如图2),若
,试求
的值.
![](https://img.xkw.com/dksih/QBM/2022/3/20/2946666806681600/2950845848518656/STEM/8c137a47-cf56-461b-9187-49de658e1751.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2022/3/20/2946666806681600/2950845848518656/STEM/6fa9275c-a6f7-43b8-87f9-0340fc8fe883.png?resizew=171)
(1)请找出图中与△ACE相似的三角形,并说明理由.
(2)以BC为直径作半圆交BF于点P(如图2),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34617702f358c8fff4a05027fd622fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
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