已知
是
的直径,
是
的切线,连接
并延长,交
于点D,连接
,
.
(1)如图1,求证:
;
(2)如图2,连接
,交
于点E,且
,求证:
;
(3)如图3,在(2)的条件下,
,点G是弧
的中点,连接
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba42cb162fb87e29e385cb383e3bf4e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/c80ec569-3f3c-4e51-99b4-d25d4c926be6.png?resizew=645)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c98a9dda854069d521a83b75dab198.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa03fe455c3c777f1a200cb6967e469.png)
(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c2ac275e3a4cb97d2e37d028d24202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d98c7cc929a327ced88a7bb671c44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
更新时间:2023-05-27 08:30:57
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】在平面直角坐标系中,O为原点,点A(3,0),点B(0,4),把△ABO绕点A顺时针旋转,得△AB′O′,点B,O旋转后的对应点为B′,O.
(1)如图1,当旋转角为90°时,求BB′的长;
(2)如图2,当旋转角为120°时,求点O′的坐标;
(3)在(2)的条件下,边OB上的一点P旋转后的对应点为P′,当O′P+AP′取得最小值时,求点P′的坐标.(直接写出结果即可)
(1)如图1,当旋转角为90°时,求BB′的长;
(2)如图2,当旋转角为120°时,求点O′的坐标;
(3)在(2)的条件下,边OB上的一点P旋转后的对应点为P′,当O′P+AP′取得最小值时,求点P′的坐标.(直接写出结果即可)
![](https://img.xkw.com/dksih/QBM/2018/11/21/2080289184620544/null/STEM/30d6594370ce423e80b6e7a46a3ce716.png?resizew=413)
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名校
【推荐2】已知,在圆O中,
是圆O的弦,点C是优弧
的中点,点E在弦
上,且
,连接
并延长交圆O于点D.
是圆O直径;
(2)如图(2)连接
,点F在弦
上,且
,连接
,并延长交圆O于点G,连接
,求证:
;
(3)如图(3)在(2)的条件下,过点D作
,交
于点K,
,过B作
于点M,交
于点N,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5817a44033087407b1c18845c17f9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8bb808edb7f81fb3c14c8f3d7f0fad.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/d3087afda61e48c2592fdf14d016e247.png)
(3)如图(3)在(2)的条件下,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4e72b78a3c67755ab78487901953a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c7d05e013aeabddd94d9c60b184401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f843b83e62bab294988a7ea134a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
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【推荐1】如图,在
中,
是直径,
是弦,
平分
且与
交于点
,过
作
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2022/11/29/3119961223421952/3137278727045120/STEM/c97bda1a3293426487a6881889b08780.png?resizew=144)
(1)求证:
是
的切线;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23f0056669be9990991cdb6da4cb625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2022/11/29/3119961223421952/3137278727045120/STEM/c97bda1a3293426487a6881889b08780.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14f6100d829f197a5dac5197bbe0b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3a4acd42af7cde8985d551ce454a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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较难
(0.4)
【推荐2】已知,在平面直角坐标系中,
为坐标原点,抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
分别交
轴于
、
两点(点
在点
的侧),与
轴交于点
,连接
,
.
(1)如图1,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252842414080/2492421106778112/STEM/f75fb23955c2477c98b89231d861c86d.png?resizew=158)
(2)如图2,
是
轴上一点(不与点
、
重合),过点
作
轴的平行线,交抛物线于点
,交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252842414080/2492421106778112/STEM/b772e3ee38244750aaa398c48a760c30.png?resizew=198)
①当点
在点
右侧时,连接AF,当
时,求
的长.
②当点
在运动时,若
、
、
中有两条线段相等,此时点
的坐标_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2b5ee1eabb64358a3d9db2349b6fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad9e91966c563d3766e7a0f1f04ddd8.png)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252842414080/2492421106778112/STEM/f75fb23955c2477c98b89231d861c86d.png?resizew=158)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252842414080/2492421106778112/STEM/b772e3ee38244750aaa398c48a760c30.png?resizew=198)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252842414080/2492421106778112/STEM/78706dc9dd7543899405bb714ac99a76.png?resizew=158)
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【推荐1】如图,AB是⊙O的直径,点C、D在⊙O上,P为BA延长线上一点,连接CA、CD、AD,且∠PCA=∠ADC,CE⊥AB于E,并延长交AD于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/26/304b1290-0657-4744-b7bb-49495e72b676.png?resizew=217)
(1)求证:PC为⊙O的切线;
(2)求证:
;
(3)若
,
,求PA的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/26/304b1290-0657-4744-b7bb-49495e72b676.png?resizew=217)
(1)求证:PC为⊙O的切线;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6d507b3534e642d32d6ce1aa31afee.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b279ed89f14a8bc3840e5fcbc7691a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83904f82975a9710b9e5b14f070af4eb.png)
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(0.4)
【推荐2】如图,
为
的直径,C、D为圆上两点,
平分
,
,
.
(1)求证:
为
切线;
(2)用直尺和圆规:作
的内心点I.并求
长;
(3)求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee273d0c7625335ed2c58242799261e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/1ab3e273-09b0-44db-95f1-07d7b5609769.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)用直尺和圆规:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445d7497f41656d5d3115dafef213972.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐3】已知:正方形ABCD,∠EAF=45°.
(1)如图,当点E、F分别在边BC、CD上,连接EF,求证:EF=BE+DF;
童威同学是这样思考的,请你和他一起完成如下解答:证明:将△ADF绕点A顺时针旋转90°,得△ABG,所以△ADF≌△ABG.
(2)如图,点M、N分别在边AB、CD上,且BN=DM.当点E、F分别在BM、DN上,连接EF,探究三条线段EF、BE、DF之间满足的数量关系,并证明你
的结论.
(3)如图,当点E、F分别在对角线BD、边CD上.若FC=2,则BE的长为 .
(1)如图,当点E、F分别在边BC、CD上,连接EF,求证:EF=BE+DF;
童威同学是这样思考的,请你和他一起完成如下解答:证明:将△ADF绕点A顺时针旋转90°,得△ABG,所以△ADF≌△ABG.
(2)如图,点M、N分别在边AB、CD上,且BN=DM.当点E、F分别在BM、DN上,连接EF,探究三条线段EF、BE、DF之间满足的数量关系,并证明你
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190674228674560/2197875942227968/STEM/2c1d8ed6cc054a70a7df2fc65f160e66.png?resizew=4)
(3)如图,当点E、F分别在对角线BD、边CD上.若FC=2,则BE的长为 .
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190674228674560/2197875942227968/STEM/61796e3a2df24a9b9b06e1d1c3739943.png?resizew=382)
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较难
(0.4)
【推荐1】郑州的发展离不开火车技术的进步,郑州北站是全亚洲最大的货运铁路编组站,最早的火车靠燃烧化学燃料推动蒸汽机为火车提供前进的动力,这时火车被称为蒸汽机车,下图是为蒸汽机车提供动力的车轮组,将其简化后得到图1,MN为活塞连杆,会从发动机FGDE中伸出缩回做往复运动,NB为长度固定的刚性连杆,随着MN的往复运动,带动车轮
上的点B做圆周运动,车轮随之转动,长度固定的刚性连杆AC带动车轮
,
转动,为蒸汽机车提供动力.
如图1所示,
,
、
、
共线,
,B为AC中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/e1d20f8d-f33a-48e4-8dba-bd0fa3674fa2.png?resizew=497)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/82608be1-e7b9-4a34-a3ec-e5b68ee74248.png?resizew=520)
(1)请就图1的情况说明三个车轮的半径
,
(2)当车轮旋转至图2时,点A与点N重合,当车轮旋转至图3时,
落在BN上,NB恰好为
的切线,并且此时
,若此时AN的长度为1,请求出图3中△ANB的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
如图1所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45db0d2d6a646e605ab1b0aed1a05702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6bb73d621b74ddc7d93f44d59d9367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcda52caf10ac86dc6d0c2a43f65265.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/e1d20f8d-f33a-48e4-8dba-bd0fa3674fa2.png?resizew=497)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/82608be1-e7b9-4a34-a3ec-e5b68ee74248.png?resizew=520)
(1)请就图1的情况说明三个车轮的半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfaba352126b40938663fe52574f486e.png)
(2)当车轮旋转至图2时,点A与点N重合,当车轮旋转至图3时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceb69edeff9bd25fd5487babc179dbc.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图1,已知
是圆O的直径,线段
,A是
上的任意一点,
与圆O相切于点F,连接
与圆O相交于点M,D是
上一点,
,
垂直于
并与
的延长线交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/76729bb0-9ddb-4c9d-8205-99d13ada12c7.png?resizew=520)
(1)当点A处于图2中
的位置时,
与圆O相切于点C,求证:
;
(2)当点A处于图3中
的位置时,
,
.求
的大小;
(3)图1中,若
,
与
的距离为3,那么
的面积S与点A的位置有没有关系,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc4087069b2fa473a101daa2872be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1a6ce0b35896c8a1c687a4376e71f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4e363bfd418579e6229230df034bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/76729bb0-9ddb-4c9d-8205-99d13ada12c7.png?resizew=520)
(1)当点A处于图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356ec98b600ece41f3a6b4bc26a7d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fde776fdaeaf209864d8bba1b2e2d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aaedab28f25a565ca5f74994d3c76fb.png)
(2)当点A处于图3中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b0c4cbf4cb535b6ce58e3ff22c3750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92eaffd47b94bc132cf8985c9ae1cb57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f60ebf316f35d8f18699b171faadc73.png)
(3)图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1a6ce0b35896c8a1c687a4376e71f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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