(1)操作发现
如图1,在五边形
中,
,
,
,试猜想
,
,
之间的数量关.小明地过仔细思考,得到如下解题思路:
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331569274413056/2331817879158784/STEM/8c08c453e87e4b07b6d233aa1d3d49c6.png?resizew=389)
将
绕点
逆时针旋转
至
.由
,得
,即点
,
,
三点共线,易证
_____,被
,
,
之间的数量关系是_______;
(2)类比探究
如图2,在四边形
中,
,
,点
,
分别在边
,
的延长线上,
,连接
,试猜想
,
,
之间的数量关系,并给出证明.
(3)拓展延伸
如图3,在
中,
,
,点
,
均在边
上,且
,若
,
,则
的长为_____.
如图1,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46b8870de8ebb3d168d07201254bffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac7036aa06c1d8c224f4a90647d4d3d.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331569274413056/2331817879158784/STEM/8c08c453e87e4b07b6d233aa1d3d49c6.png?resizew=389)
将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb13a1d041889a1b735324a07edcb19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01e93b8d820c7830945fccac6e090ca.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d4111ce0f6fcfd45bac047513a8af6.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)类比探究
如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1e19f45215ecbc7b0d015f900deb5e.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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)拓展延伸
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2019-11-11 21:58:31
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】 在平面直角坐标系xOy中,A,B,C如图所示.
(1)作出
关于y轴的对称图形
,写出点A1__________ B1__________ C1____________;
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619800730574848/2620249932578816/STEM/a318c008-9fdf-446b-ad68-ee52e53aa6d7.png?resizew=273)
(2)用全等三角形的知识,用无刻度的直尺,在BC上找一点P,使得∠BAP =45°,写出作图过程,并加以证明.
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619800730574848/2620249932578816/STEM/fc654228-c5c7-48f0-bfb2-db8656374057.png?resizew=274)
(3)用全等三角形的知识,用无刻度的直尺,作三角形AC边的高BH,写出作图过程,无需证明.
(1)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619800730574848/2620249932578816/STEM/a318c008-9fdf-446b-ad68-ee52e53aa6d7.png?resizew=273)
(2)用全等三角形的知识,用无刻度的直尺,在BC上找一点P,使得∠BAP =45°,写出作图过程,并加以证明.
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619800730574848/2620249932578816/STEM/fc654228-c5c7-48f0-bfb2-db8656374057.png?resizew=274)
(3)用全等三角形的知识,用无刻度的直尺,作三角形AC边的高BH,写出作图过程,无需证明.
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619800730574848/2620249932578816/STEM/6cc14de0-2460-405a-b0de-846300a50d58.png?resizew=270)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点,
的三个顶点都是格点,边
上的
也是一个格点,
是
与网格线的交点.仅用无刻度的直尺在给定网格中完成画图,画图过程用虚线表示,画图结果用实线表示.
(1)如图1,在
上画点
,使
;
(2)如图1,在
上画点
,使
;
(3)如图2,画出点
关于
的对称点
;再将
绕点
逆时针旋转角度
(
)得到
,其中
,
的对应点分别为
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d009739b5b5362c7902eeeada94adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/ae2bb33d-841f-49f1-b823-e6ef7d6fb30e.png?resizew=299)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
(2)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be4c1f56e06ed74607e15dbd13455b3.png)
(3)如图2,画出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e82892d5e99bc95c301656a90997f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baeb4b118729e4c0136faecc0b338906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
中,
,点D在AB上,
,
,
于点E,把
绕点D旋转得
,且点G,F在AC上.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892078096506880/2920308764631040/STEM/0f491762-e316-478c-b0d9-26ff77ac83a0.png?resizew=234)
(1)求证:四边形
是正方形;
(2)求四边形
的面积,
![](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/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40277f2c88dc0b716383fc785df8ab7c.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892078096506880/2920308764631040/STEM/0f491762-e316-478c-b0d9-26ff77ac83a0.png?resizew=234)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】折一折:将正方形纸片
折叠,使边
都落在对角线
上,展开得折痕
,连接
,如图1.
(1)
;
(2)转一转:将图1中的
绕点A旋转,使它的两边分别交边
于点P、Q,连接
,如图2.写出线段
之间的数量关系,并说明理由;
(3)连接正方形对角线
,若图2中的
的边
分别交对角线
于点M、点N,如图3,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce8ebe684ab4fd905deddd160462847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b7672143546c165b341d76f70e8da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/94e1ba48-0883-494e-9abb-9aab0d6581f6.png?resizew=558)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)转一转:将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5141e0c913ff7ea7787d48f7c1d984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9f38dbfc1b9748b707859059c8a326.png)
(3)连接正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20913ceb5500cd01ee883db4a14b1ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e53cf4715617576ddcaccce03b7969.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】在平面直角坐标系中,把一条线段绕其一个端点逆时针旋转,并把这条线段伸长或缩短,称这样的运动叫做线段的“旋似”,经“旋似”运动后新线段和原线段的夹角为“旋似角”,新线段长和原线段长比值为“旋似比”;如图,平面直角坐标系xOy中有一点A(2,6),把线段OA绕点O做“旋似”运动,点A的对应点是点B,若“旋似角”为90°,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/3de5846d-8abd-4abb-bc1c-794bed8c5ca5.png?resizew=260)
(1)当“旋似比”为3时,点B恰落在一个反比例函数图象上,求该反比例函数的解析式;
(2)过B做BF⊥x轴,点F为垂足,联结AB,若△AOB与△BOF相似,求此时的“旋似比”;
(3)当“旋似比”为
时,过点A作AE⊥x轴,垂足为E,点D是y轴上一点,且满足∠BDO=∠OAE,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/3de5846d-8abd-4abb-bc1c-794bed8c5ca5.png?resizew=260)
(1)当“旋似比”为3时,点B恰落在一个反比例函数图象上,求该反比例函数的解析式;
(2)过B做BF⊥x轴,点F为垂足,联结AB,若△AOB与△BOF相似,求此时的“旋似比”;
(3)当“旋似比”为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
您最近一年使用:0次