在
和
中,
,
,
,连接
交于点M,
与
交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/550f9480-faa9-46a6-8812-604b8d086ff9.png?resizew=313)
(1)如图1,求证
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)如图2,若
,M为
中点,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d3c378b1118d331d30b63fc587b270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/550f9480-faa9-46a6-8812-604b8d086ff9.png?resizew=313)
(1)如图1,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cad39ccdd4fe036dbf08efa9b20a842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781ccc2cdcc1683d5a1366ebce65e689.png)
更新时间:2022-12-19 19:33:49
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知
,点
为平面内一点,
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716694142033920/2785984603504640/STEM/5bf57708-cf47-4d57-a74e-0117897fbd06.png?resizew=325)
(1)如图1,直接写出
和
之间的数量关系;
(2)如图2,
是
反向延长线上一点,连接
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9207d8adfea89a742987ced3fb388bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716694142033920/2785984603504640/STEM/5bf57708-cf47-4d57-a74e-0117897fbd06.png?resizew=325)
(1)如图1,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb138968e1bcbcd84e4dda73e0da7c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
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名校
【推荐2】如图,点E在
的延长线上,已知
,
.
;
(2)连接
,若
和
的平分线相交于点F,如图所示,试探究
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
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【推荐3】已知△ABC,点E是直线AC上一个动点(不与A、C重合),点F是BC边上一个定点,过点E做DE
BC,交直线AB于点D,链接BE,过点F做FG
BE, 交直线AC于点G.
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946696700624896/2987475874897920/STEM/17fa9876-5527-4ed4-901a-36c2e17f9dfb.png?resizew=352)
(1)如图①,当点E在线段AC上时,求证:∠DEB=∠GFC;
(2)在(1)的条件下,判断∠DEC、∠EGF、∠BFG这三个角的度数和是否为一个定值?如果是,求出这个值,如果不是,说明理由;
(3)如图②,当点E在线段AC的延长线上时(2)中的结论是否仍然成立?如果不成立,请直接写出∠DEC、∠EGF、∠BFG之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946696700624896/2987475874897920/STEM/17fa9876-5527-4ed4-901a-36c2e17f9dfb.png?resizew=352)
(1)如图①,当点E在线段AC上时,求证:∠DEB=∠GFC;
(2)在(1)的条件下,判断∠DEC、∠EGF、∠BFG这三个角的度数和是否为一个定值?如果是,求出这个值,如果不是,说明理由;
(3)如图②,当点E在线段AC的延长线上时(2)中的结论是否仍然成立?如果不成立,请直接写出∠DEC、∠EGF、∠BFG之间的关系.
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【推荐1】已知在
中,
,
,
的度数之比为
,
平分
.在直角三角形
中,
,
.如图1,
的边
在直线
上,将
绕点
逆时针方向旋转,记旋转角为
.完成下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/adc6d479-cd0c-45f7-9384-8cd961243d94.png?resizew=436)
(1)在
中,
______
,
______
.
(2)在旋转过程中,如图2,当
______
时,
;当
______
时,
.
(3)如图3,当点
在
内部时,边
,
分别交
,
的延长线于
,
两点.
①此时,
的取值范围是______;
②
与
之间有一种始终保持不变的数量关系,请写出该数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6f3b85253e652165c07f566eccd915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fb7cc752222306029fabbeb894a800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c644552971b3cd35d40ae732407baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/adc6d479-cd0c-45f7-9384-8cd961243d94.png?resizew=436)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)在旋转过程中,如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①此时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1a67f1ffb62274c4faefc197a4cf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c378e2e427a45884e28fea4cce3def.png)
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【推荐2】如图
,已知线段
、
相交于点
,连接
、
,我们把形如图
的图形称之为“
字形”
试解答下列问题:
![](https://img.xkw.com/dksih/QBM/2023/1/6/3147068913745920/3149367121657856/STEM/f44e292c333a4d55b17079922cfba020.png?resizew=399)
(1)在图
中,写出
、
、
、
之间关系;
(2)如图
,在(1)的结论下,
和
的平分线
和
相交于点
,并且与
、
分别相交于点
、
.
仔细观察,在图
中有______个以线段
为边的“
字形”;
若
,
,试求
的度数;
和
为任意角时,其他条件不变,试直接写出
与
、
之间数量关系,不需说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://img.xkw.com/dksih/QBM/2023/1/6/3147068913745920/3149367121657856/STEM/f44e292c333a4d55b17079922cfba020.png?resizew=399)
(1)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a9d4526ddf01eb414b7257661799b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce6c8659bfef1f79b0796d500b924a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44164e4e879f477834235a67f9ad4826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐3】央视科教频道播放的《被数学选中的人》节目中说到:“数学区别于其它学科最主要的特征是抽象与推理”.几何学习尤其需要我们从复杂的问题中进行抽象,形成一些基本几何模型,用类比等方法,进行再探究、推理,以解决新的问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/f0067fe7-a70e-458b-9c75-163a5b4fc0f8.png?resizew=381)
(1)【模型探究】如图1,
和
中,
,
,且
连接
,
.这一图形称“手拉手模型”.求证:
.
(2)【模型指引】如图2,
中,
,
,以B为端点引一条与腰
相交的射线,在射线上取点D,使
,求:
的度数.
小亮同学通过观察,联想到手拉手模型,在
上找一点E,使
,最后使问题得到解决.请你帮他写出解答过程.
(3)【拓展延伸】如图3,
中,
,
为任意角度,若射线
不与腰
相交,而是从端点B向右下方延伸.仍在射线上取点D,使
,试判断
与
有何数量关系?并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/f0067fe7-a70e-458b-9c75-163a5b4fc0f8.png?resizew=381)
(1)【模型探究】如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab083b4fd82749bcf218be6131baac63.png)
(2)【模型指引】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ad623f3a05ecdc27b3f3e0169669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5ddf64b50888a89ce973a7cb4dda03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
小亮同学通过观察,联想到手拉手模型,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
(3)【拓展延伸】如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5ddf64b50888a89ce973a7cb4dda03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知
与
都是等腰直角三角形,其中
,
为
边上一点.
(1)试判断
与
的大小关系,并说明理由;
(2)试说明
三者之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.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/2023/11/9/aeb12ae4-c08e-4b79-8189-f26527b9e7e2.png?resizew=188)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159276154a34ea181e31c284e9f6c096.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
是等边三角形,
、
分别是
、
上的点,且
,
与
交于点
.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/a51dfab0c1ec275ff83d08c7293968c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2b7f63f07b00047cbb272fb1f77f60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/5e719cd1-2796-45bb-a9d0-1d95a5bb9034.png?resizew=142)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,四边形
是正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b3f9eb22-66fe-49e1-a740-eb18e7c3c3c1.png?resizew=160)
(1)尺规作图:在正方形内作等边
;
(2)连接
、
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b3f9eb22-66fe-49e1-a740-eb18e7c3c3c1.png?resizew=160)
(1)尺规作图:在正方形内作等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,在平面直角坐标系中,点A的坐标为(﹣1,0),点B的坐标为(3,0),以AB为直径的⊙M与y轴的正半轴交于点C.点P是劣弧BC上的一动点.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959406258380800/2961465962414080/STEM/7c13b815-31ec-401d-bc1c-caca2c3b0696.png?resizew=403)
(1)求sin∠ABC的值.
(2)当△PCB中有一边是BP的两倍时,求相应AP的长.
(3)如图2,以BC为边向上作等边△CBD,线段MD分别交BC和
于点H,N.连结DP,HP.点P在运动过程中,DP与HP存在一定的数量关系.
【探究】当点P与点N重合时,求
的值;
【探究二】猜想:当点P与点N不重合时,【探究】的结论是否仍然成立.若成立,给出证明:若不成立,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959406258380800/2961465962414080/STEM/7c13b815-31ec-401d-bc1c-caca2c3b0696.png?resizew=403)
(1)求sin∠ABC的值.
(2)当△PCB中有一边是BP的两倍时,求相应AP的长.
(3)如图2,以BC为边向上作等边△CBD,线段MD分别交BC和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
【探究】当点P与点N重合时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b5edc31a562c314d3d3a4f19ad6c7c.png)
【探究二】猜想:当点P与点N不重合时,【探究】的结论是否仍然成立.若成立,给出证明:若不成立,请说明理由.
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐3】如图,在平面直角坐标系中,直线
与
轴、
轴分别交于
、
两点,点
在
轴上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/1a886fc9-8d19-4add-961a-e34b71874889.png?resizew=291)
(1)点
的坐标为 ;
(2)若动点
从点
出发,沿
向点
运动,同时动点
从点
出发,沿
方向向点
运动,动点
的运动速度是每秒1个单位长度,动点
的运动速度是每秒2个单位长度,设
的面积为
,点
的运动时间为
秒,求
与
之间的函数关系式,并写出自变量
的取值范围;
(3)在(2)的条件下,当
的面积最大时,
轴上有一点
,则平面内是否存在一点
使得以
,
,
,
为顶点的四边形构成以
为边的菱形?若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376cfee8fde879fa970718bdbb58c8b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/1a886fc9-8d19-4add-961a-e34b71874889.png?resizew=291)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a6be08c747b22834f1425c6253eebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc3919b5000f9af77ddb77a62bee9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc3919b5000f9af77ddb77a62bee9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次