问题提出:已知矩形
,点
为
上的一点,
,交
于点
.将
绕点
顺时针旋转
得到
,则
与
有怎样的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7780162d-fd46-4d3c-affa-73794be6ea7a.png?resizew=396)
问题探究
(1)探究一:如图,已知正方形
,点
为
上的一点,
,交
于点
.
①如图1,直接写出
的值 ;
②将
绕点
顺时针旋转到如图2所示的位置,连接
、
,猜想
与
的数量关系,并证明你的结论;
(2)探究二:如图,已知矩形
,点
为
上的一点,
,交
于点
.如图3,若四边形
为矩形,
,将
绕点
顺时针旋转
得到△
、
的对应点分别为
、
点),连接
、
,则
的值是否随着
的变化而变化.若变化,请说明变化情况;若不变,请求出
的值.
(3)一般规律
如图3,若四边形
为矩形,
,其它条件都不变,将
绕点
顺时针旋转
得到△
,连接
,
,请直接写出
与
的数量关系.
(4)问题解决
如图4,当
时,其他条件不变,
绕点
顺时针旋转,设旋转角为
,当
时,写出此时
.
(5)拓展延伸
如图5,点
是正方形
对角线
上一点,连接
,过点
作
,交线段
于点
,交线段
于点
,连接
交线段
于点
.给出下列四个结论,①
;②
;③
;④
;
正确的结论有 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496c8a4cf565eda9e9a107e216fd93e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7780162d-fd46-4d3c-affa-73794be6ea7a.png?resizew=396)
问题探究
(1)探究一:如图,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图1,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ffa85c34fdc3f25143ec84888ff2d25.png)
②将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)探究二:如图,已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e418a43f907cc832b5542b054e5cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd66409de376afe0135462a221c08ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72124afe6bc0ae5db3ee4e706649ca0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424f0409d85b5f85162e3c17b1daebfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424f0409d85b5f85162e3c17b1daebfc.png)
(3)一般规律
如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e9dca69a8e35a624024e392379a995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda32513cc5c012efdfde596549dbe43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
(4)问题解决
如图4,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26c2c53046cbfe83f84f5393373589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813472fe85905302843cb3aadec9c8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a5594708b3d94026c639aff4446b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(5)拓展延伸
如图5,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e43ba3d22771e5000e3df8fd4a42df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7db8451244b625f7bed403b5eacd854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6df3e35040f838c5007ed1fdd0519f1.png)
正确的结论有 个.
更新时间:2022-10-31 12:00:02
|
相似题推荐
解答题-证明题
|
困难
(0.15)
名校
【推荐1】如图1,等腰
中,
,点D,E,F分别为边
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/eadae91f-0455-402a-b361-b2688788e4c1.png?resizew=398)
(1)连接
相交于点G,连接
并延长交
的延长线于点H.若
,求
的度数;
(2)如图2,在(1)问的条件下,在平面内将线段
绕点B顺时针旋转90°得线段
,连接
.求证:
;
(3)如图3,若D为
中点,
,连接
,点M为
中点,点K为线段
上一点,将
沿着直线
翻折至
所在平面内得到
,连接
,在点E、F运动的过程中,当线段
取最小值且
时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149d217efaf5090696904003ec06393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0e08a39c6619123557148d195abfbe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/eadae91f-0455-402a-b361-b2688788e4c1.png?resizew=398)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19097651607095bc2bf9298bb964c392.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/64923c5f4d9f85e549b9d26a0c8ca7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6567f04a1bfbf57c21ac8bc4893375.png)
(2)如图2,在(1)问的条件下,在平面内将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5634a208294350f8ec151cd19b6d3278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c49ed665ff7d80c21821a0f874e0377.png)
(3)如图3,若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.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/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eeeae30b956ed72f8711c1662792db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97223e7c3ff2c78bdedae87a8ba66112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eeeae30b956ed72f8711c1662792db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72210c49bfbac0445a1056fcfc9c913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0684ae6583d649c9d603d4383c852f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb6c946b5f89acfa8bbeefd8fd37e78.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
解题方法
【推荐2】已知点O在△ABC内,且知OB和OC分别平分∠ABC和∠ACB,过O作直线EF分别交AB、AC于E、F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/bcef9d27-a9b5-45a5-a71f-1a6d8dc9bcd2.png?resizew=404)
(1)如图1,已知EF∥BC.
①若∠A=76°,请直接写出∠BOE+∠COF的度数;
②猜想∠BOE、∠COF与∠A之间有怎样的数量关系?写出结论,不用证明
(2)直线EF绕点O旋转到如图2的位置时(EF与BC不平行),那么上面(1)②中猜想的结论还成立吗?如果成立,请给出证明;如果不成立,请说明理由.
(3)当直线EF绕点O旋转到如图3的位置时(点E在AB的延长线上),请直接写出∠BOE、∠COF与∠A之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/bcef9d27-a9b5-45a5-a71f-1a6d8dc9bcd2.png?resizew=404)
(1)如图1,已知EF∥BC.
①若∠A=76°,请直接写出∠BOE+∠COF的度数;
②猜想∠BOE、∠COF与∠A之间有怎样的数量关系?写出结论,不用证明
(2)直线EF绕点O旋转到如图2的位置时(EF与BC不平行),那么上面(1)②中猜想的结论还成立吗?如果成立,请给出证明;如果不成立,请说明理由.
(3)当直线EF绕点O旋转到如图3的位置时(点E在AB的延长线上),请直接写出∠BOE、∠COF与∠A之间的数量关系.
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐3】如图,点P是∠MON内的一点,过点P作PA⊥OM于点A,PB⊥ON于点B,且OA=OB
(1)求证:PA=PB;
(2)如图②,点C是射线AM上一点,点D是线段OB上一点,且∠CPD+∠MON=180°,若OC=8,OD=5.求线段OA的长.
(3)如图③,若∠MON=60°,将PB绕点P以每秒2°的速度顺时针旋转,12秒后,PA开始绕点P以每秒10°的速度顺时针旋转,PA旋转270°后停止,此时PB也随之停止旋转.旋转过程中,PA所在直线与OM所在直线的交点记为G,PB所在直线与ON所在直线的交点记为H.问PB旋转几秒时,PG=PH?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/a1b50149-c425-4c2a-a444-db6998726e64.png?resizew=477)
(1)求证:PA=PB;
(2)如图②,点C是射线AM上一点,点D是线段OB上一点,且∠CPD+∠MON=180°,若OC=8,OD=5.求线段OA的长.
(3)如图③,若∠MON=60°,将PB绕点P以每秒2°的速度顺时针旋转,12秒后,PA开始绕点P以每秒10°的速度顺时针旋转,PA旋转270°后停止,此时PB也随之停止旋转.旋转过程中,PA所在直线与OM所在直线的交点记为G,PB所在直线与ON所在直线的交点记为H.问PB旋转几秒时,PG=PH?
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐1】如图,在
中,
,点P从点C出发,以每秒2个单位长度的速度沿
方向向点A运动,同时,点Q从点B出发,以每秒1个单位长度的速度沿
方向向点C运动.当一个点到达终点时,另一个点也随之停止运动.连接
,在射线
上截取
,以
为邻边作菱形
,设运动时间为t秒
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/da4619e9-3b89-4443-8de6-9e2cc92a5a95.png?resizew=353)
(1)当
时,求菱形
的面积.
(2)当
的面积为菱形
面积的
时,求t的值.
(3)作点B关于直线
的对称点
.
①当
时,求线段
的长.
②当点
落在菱形
的边上时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3041e954f2249c6437fd7d73fdb428c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6b6b2fbc4cb768a52ddf9f5e6f1f5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cde7e9ed002a30e4d3e2f94513c75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cb7a12bb8797615303fc20adb9f988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cea72e0c37257bcfd85a59ef8dd0f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/da4619e9-3b89-4443-8de6-9e2cc92a5a95.png?resizew=353)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cb7a12bb8797615303fc20adb9f988.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cb7a12bb8797615303fc20adb9f988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(3)作点B关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f6d25d185db6fc2a69f90ace9a6477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cb7a12bb8797615303fc20adb9f988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71357212061246a63dcedd1a3376cc2.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图1,矩形
中,
,
,点E在边
上运动(不与点B和点C重合),将
绕点A顺时针旋转得到
,旋转角等于
,连接
,过点F作
于点M.
;
(2)当直线
恰好经过点E时,求
的长;
(3)如图2,连接
.
①当
时,求
的值;
②探究
是否存在最小值,若存在,请求出这个最小值,若不存在,请说明理由.
![](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/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790d5327d89fc1b3145e546482a46a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5b4b475342ba762ccd17b077f79835.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d390df2733a81db86f0556dba8af0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
②探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次