如图,
,
于点
,
与
相交于点
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772f70f0b2b262ea9633921eb48c692a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b92bdf778aa32f238bad820d72d62f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e56feb858a38f68412d4d7691fcf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcae9d00980803e5955228d1e217abe.png)
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701193125953536/2701260730785792/STEM/fe62f4789e5b4ac29f15be9044e1ab4e.png?resizew=125)
20-21七年级下·全国·课后作业 查看更多[1]
(已下线)2.3 平行线的性质-2020-2021学年七年级数学下册十分钟同步课堂专练(北师大版)
更新时间:2021-04-16 21:11:56
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】完成下列推理过程:
(1)如图,已知AB∥CD,∠B+∠D=180°.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896533464956928/2971490483118080/STEM/008cf159-f25f-4a0b-b285-5f582265a6f3.png?resizew=210)
求证:BC∥DE
证明:∵AB∥CD(已知)
∴∠ =∠ ( );
∵∠B+∠D=180°( 已知 )
∴∠ +∠D=180°( 等量代换 )
∴BC∥DE( )
(2)如图,若已知∠1=∠2,试完成下面的填空.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896533464956928/2971490483118080/STEM/4a98aab0-798f-4ec2-a4ad-e1926a153e4d.png?resizew=245)
∵∠2=∠3( )
又∵∠1=∠2(已知)
∴∠ =∠ ( 等量代换 )
∴ ∥ ( )
(1)如图,已知AB∥CD,∠B+∠D=180°.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896533464956928/2971490483118080/STEM/008cf159-f25f-4a0b-b285-5f582265a6f3.png?resizew=210)
求证:BC∥DE
证明:∵AB∥CD(已知)
∴∠ =∠ ( );
∵∠B+∠D=180°( 已知 )
∴∠ +∠D=180°( 等量代换 )
∴BC∥DE( )
(2)如图,若已知∠1=∠2,试完成下面的填空.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896533464956928/2971490483118080/STEM/4a98aab0-798f-4ec2-a4ad-e1926a153e4d.png?resizew=245)
∵∠2=∠3( )
又∵∠1=∠2(已知)
∴∠ =∠ ( 等量代换 )
∴ ∥ ( )
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解答题-证明题
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适中
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【推荐2】推理填空
已知:如图,点
在直线
上,点
在直线
上,
,
,求证:
.
(______)
(______)
(______)
______
______(______)
______
(______)
又
(已知)
(等量代换)
(______)
(______).
已知:如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b1fe9e36e3c6c432588154d02647ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb666a8f608704cfdfa52be0b07bd7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebef260cfb74643261bfaf7665a458a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05287a3cb028b40b4ca2b790de54c030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab124b302999b9122807d1cd9808466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7698322222612578b1ddb991f776853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18964a6e3a954dc37fd5e259e3f941a8.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图是一个“鱼”形图案,点B,C分别在∠A的两边上.已知∠1=50°,∠2=50°,∠3=130°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/d89a8366-639e-408a-870d-5b5d2aa62993.png?resizew=184)
(1)找出图中的平行线,并说明理由;
(2)求∠A的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/d89a8366-639e-408a-870d-5b5d2aa62993.png?resizew=184)
(1)找出图中的平行线,并说明理由;
(2)求∠A的度数.
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解答题-证明题
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适中
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【推荐2】如图1,在四边形
(
)中,
,
,
,
,动点P在线段
上以
的速度由点A向点B运动,同时点Q以
的速度由点B向点C运动.设点P的运动时间为
.
(1)
cm;(用含t的式子表示)
(2)当
,
时.
①
与
全等吗?为什么?
②求证
;
(3)如图2,若“
,
”改为“
(
为钝角)”,其他条件不变,当点P,Q运动到某处时,有
与
全等,
写出此时v,t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4652f95f3a388706906bc85f53f8db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700d946aa8e33e2215f20586cb6ff923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7961242231c1ac76fcb22cbe2751956c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/14128d2e-4ce9-4669-b16a-d7101d1eaa14.png?resizew=319)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8078dbafd61c991e1ca41d37c2d8d13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
②求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbc27d36cc39b7e634c51b944c9a947.png)
(3)如图2,若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e6796e1faad54ed87cadae99fa4e077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c56dbad3aeb398ece9e50f168387424.png)
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解答题-问答题
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适中
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【推荐1】如图所示,在 中,已知
是角平分线,
,
.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
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解答题-证明题
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名校
【推荐2】如图,AD,BC相交于点E,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621793378017280/2623963639341056/STEM/b8ab1240-7b3c-4452-a829-e9442601ff00.png)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621793378017280/2623963639341056/STEM/b8ab1240-7b3c-4452-a829-e9442601ff00.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad78f066f4071d12f440b9d8dd123ee7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c3a56a6807a4603af950b4822463e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
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