(1)已知,如图BC交DE于O,给出下面三个论断:①∠B=∠E;②AB
DE;③BC
EF.请以其中的两个论断为条件,填入“题设”栏中,以一个论断为结论,填入“结论”栏中,使之成为一个正确的命题,并加以证明.
题设:已知如图,BC交DE于O, .(填题号)
结论:那么 .(填题号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/703a40c7-2732-4e8e-83f0-774b5f14c2b1.png?resizew=183)
(2)已知∠ABC=180°-∠A,BD⊥CD于D,EF⊥CD于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/7798df12-3471-402d-bc69-9f41fc5ee36b.png?resizew=228)
①求证:AD
BC;
②若∠1=36°,求∠2的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
题设:已知如图,BC交DE于O, .(填题号)
结论:那么 .(填题号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/703a40c7-2732-4e8e-83f0-774b5f14c2b1.png?resizew=183)
(2)已知∠ABC=180°-∠A,BD⊥CD于D,EF⊥CD于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/7798df12-3471-402d-bc69-9f41fc5ee36b.png?resizew=228)
①求证:AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
②若∠1=36°,求∠2的度数.
更新时间:2022-08-30 23:50:45
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】下列定理中,哪些有逆定理?如果有逆定理,请写出逆定理.
(1)同旁内角互补,两直线平行.
(2)三边对应相等的两个三角形全等.
(1)同旁内角互补,两直线平行.
(2)三边对应相等的两个三角形全等.
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,已知
,
,试证明
.完成以下解答过程中的空缺部分;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/0f35e790-d998-43ef-830a-30edeab5dcd9.png?resizew=134)
解:∵
(已知)
∴
( )
∴
(等量代换)
∴
( )
∴
( )
∵
(已知)
∴
( )
∴___________(内错角相等,两直线平行)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b63471d391f3bebfc8a4b899d4c820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/0f35e790-d998-43ef-830a-30edeab5dcd9.png?resizew=134)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b63471d391f3bebfc8a4b899d4c820.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dcafa5ab8042dccfac16710db5e363f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b4e97618f0af8c34ce1e9439f57416.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97382b3215997c3fcd6e2010e64cb768.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f958d4e4424d9a21fd5eed49c656b226.png)
∴___________(内错角相等,两直线平行)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐1】如图,在
和
中,
,
,
,
在同一直线上,下面给出四个论断:
(1)
; (2)
; (3)
; (4)
.
请把上述论断中的三个作为条件,余下的一个作为结论,写出一个真命题,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c244edbf77fbb8e9c017515e370c5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00f89f6fd05f521d05129244aa4e5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
请把上述论断中的三个作为条件,余下的一个作为结论,写出一个真命题,并给出证明.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】将下列命题改写成“如果…,那么…”的形式,并判断它们是真命题还是假命题,若是假命题,请举出反例.
(1)互为相反数的两个数的和为零;
(2)同旁内角互补;
(3)等角的余角相等.
(1)互为相反数的两个数的和为零;
(2)同旁内角互补;
(3)等角的余角相等.
您最近一年使用:0次