如图,直线
相交于点O,
平分
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acc3b50b12699a4a9a4cc391b8f5bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3209e0f378ef0b3d7c0ffd5c2d689afd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/a037bdd7-adf0-4006-812a-3206681ba420.jpg?resizew=162)
更新时间:2023-09-06 10:25:26
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【推荐1】如图,在
中,
.动点P从点A出发以每秒1个单位长度沿
向终点C运动,同时动点Q以每秒2个单位长度从点B出发沿
向点A运动,到达A点后立刻以原来的速度沿
返回.当点Q到达点B时停止运动,点P也同时停止.连接
,设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f89cb7c6-b8dd-468e-b6d5-c1e0a3916fc0.jpg?resizew=136)
(1)记
的面积为S,请用含有t的代数式来表示S;
(2)伴随着P,Q两点的运动,线段
的垂直平分线为直线l,当直线l经过点A时,求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b3fd8b668748bc896ebd45e32b6a17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f89cb7c6-b8dd-468e-b6d5-c1e0a3916fc0.jpg?resizew=136)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0719ae600f0efeeaba659bb54e2edc6e.png)
(2)伴随着P,Q两点的运动,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
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【推荐2】如图,长方形ABCD中,AB=4cm,BC=8cm.点P从点A出发,沿AB匀速运动;点Q从点C出发,沿C→B→A→D→C的路径匀速运动.两点同时出发,在B点处首次相遇后,点P的运动速度每秒提高了3cm,并沿B→C→D→A的路径匀速运动;点Q保持速度不变,继续沿原路径匀速运动,3s后两点在长方形ABCD某一边上的E点处第二次相遇后停止运动.设点P原来的速度为xcm/s.
(1)点Q的速度为 cm/s(用含x的代数式表示);
(2)求点P原来的速度.
(3)判断E点的位置并求线段DE的长.
(1)点Q的速度为 cm/s(用含x的代数式表示);
(2)求点P原来的速度.
(3)判断E点的位置并求线段DE的长.
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120765842874368/2123756907659264/STEM/b7241e0cf36e4118bdab73eb49cd203e.png?resizew=152)
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【推荐1】已知∠COD在∠AOB的内部,∠AOB=150°,∠COD=20°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/6256d289-5fb6-4544-90f4-718746b7945a.png?resizew=546)
(1)如图1,求∠AOD+∠BOC的大小;
(2)如图2,OM平分∠BOC,ON平分∠AOD,求∠MON的大小.
(3)如图3,若∠AOC=30°,射线OC绕点O以每秒10°的速度顺时针旋转,当与射线OB重合后,再以每秒15°的速度绕点O逆时针旋转;同时射线OD以每秒30°的速度绕点O顺时针旋转.设射线OD,OC运动的时间是t秒(0<t≤22),当∠COD=120°时,直接写出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/6256d289-5fb6-4544-90f4-718746b7945a.png?resizew=546)
(1)如图1,求∠AOD+∠BOC的大小;
(2)如图2,OM平分∠BOC,ON平分∠AOD,求∠MON的大小.
(3)如图3,若∠AOC=30°,射线OC绕点O以每秒10°的速度顺时针旋转,当与射线OB重合后,再以每秒15°的速度绕点O逆时针旋转;同时射线OD以每秒30°的速度绕点O顺时针旋转.设射线OD,OC运动的时间是t秒(0<t≤22),当∠COD=120°时,直接写出t的值.
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【推荐2】我们学习了“角平分线”的定义,知道角平分线在角的计算中有着非常重要的作用,请根据所学知识进行下列探究:
已知,
,
,
分别平分
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/2914b2ef-f67f-4ee9-8c7b-2451bc1181cc.png?resizew=411)
(1)如图①,
,
在同一直线上,则
_________;
(2)如图②,
在
内部,且
,则
_________;
(3)若将(2)中
改为
,其他条件不变,请求出
的度数.
已知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046c84062c7f4ef9bd9daca387b6bf64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/2914b2ef-f67f-4ee9-8c7b-2451bc1181cc.png?resizew=411)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecad6cdbd87811e90c95331da8a8eff.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fab6cd81ba9683d7c48ce2c476d36e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecad6cdbd87811e90c95331da8a8eff.png)
(3)若将(2)中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fab6cd81ba9683d7c48ce2c476d36e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30b02c7213f57d3c6c3d65e0650a926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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【推荐2】已知
是直线
上的一点,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/487e3b31-ad93-4ba4-b49d-cfdf6a7480f8.png?resizew=333)
(1)如图1,射线
在直线
的同侧.
①若
______;若
______度;
②猜想
与
之间的数量关系;
③若
的内部有一射线
,射线
将
分为1∶4两部分,求
的度数;
(2)如图2,射线
在直线
的异侧,判断
与
之间的数量关系与②中的是否相同,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f5f6efc64a4da943fe867b95a9bb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/487e3b31-ad93-4ba4-b49d-cfdf6a7480f8.png?resizew=333)
(1)如图1,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ba6d3a4b110f65a8d203aeadd03ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1703e4e4ad064cf005e8a8a68ff5ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254eef58e8afc3f4ab0658e4ade5a5de.png)
②猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6d3e691485b3e4a089fdc0da65f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb60036876b3c5aa09bb9570e57328b.png)
(2)如图2,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ba6d3a4b110f65a8d203aeadd03ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
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【推荐1】如图
,
,
、
交于点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
(1)若
,
,求
的长.
(2)连接
、
求证
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b455b110a30c1533d0a0657e0e48ac33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/dee50a23604ea2a9c1f3649dab97c2e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/1a1ccc02-f0c6-48a2-a1b3-f60e7ed9aa94.png?resizew=139)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b25f247281afb586b3c686687eae858.png)
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【推荐2】如图,直线AB与CD相交于点O,
,
.
![](https://img.xkw.com/dksih/QBM/2019/2/1/2131248970637312/2132035838033920/STEM/8bf34b7a2a284e6e86dbe23cc07a15fb.png?resizew=187)
(1)图中
的余角有哪些.(把符合条件的角都写出来);
(2)图中除直角相等外,还有相等的角,请写出三对;
(3)(i)如果
,那么根据什么可得
的度数;
(ii)如果
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a7d08ea8d106cfa47ae8cb1b32e159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc941f9b322d2f68fba4a396c224aa9.png)
![](https://img.xkw.com/dksih/QBM/2019/2/1/2131248970637312/2132035838033920/STEM/8bf34b7a2a284e6e86dbe23cc07a15fb.png?resizew=187)
(1)图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3776120062b21aa71fdf5166d0950cd0.png)
(2)图中除直角相等外,还有相等的角,请写出三对;
(3)(i)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884f5b7a7325f5e3bd613b4bf4a628bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2edaf7aabedc5665b91aa77f861a8c.png)
(ii)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/660c364a44ca5095e2508e38864b4826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282c14512c29eb6b8e73693d70afc90a.png)
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