如图所示,∠1=70°,有下列结论:①若∠2=70°,则AB∥CD,②若∠5=70°,则AB∥CD;③若∠3=110°,则AB∥CD;④若∠4=110°,则AB∥CD.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957103688286208/1957762802016256/STEM/a3dca7c401d5496fa10907cd56a92ea7.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957103688286208/1957762802016256/STEM/a3dca7c401d5496fa10907cd56a92ea7.png?resizew=143)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2015-06-29 14:41:49
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【推荐1】如图,直线a,b,c被直线l所截,下列条件中:①
1=
3,
4=
5;②
2+
3=
,
3=
7;③
1=
2,
5=
6;④
2=
3,
4=
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
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A.①②③④ | B.①②③ | C.①② | D.①②④ |
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【推荐2】如图,有下列条件:①
;②
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的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/56049d4e-c1e0-48d3-bb60-a7010b0d857c.png?resizew=151)
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A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐1】如图,梯形ABCD中,AB∥CD,∠A=90°,E在AD上,且CE平分∠BCD,BE平分∠ABC,则下列关系式中成立的有( )
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![](https://img.xkw.com/dksih/QBM/2019/8/16/2270081472700416/2270291397410816/STEM/caba565ffd2e4b478bf60f6b00fa55b2.png?resizew=92)
①
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【推荐2】如图,下列条件中可得到AD∥BC的是 ( )
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①AC⊥AD AC⊥BC;②∠1=∠2,∠3=∠D;③∠4=∠5 ④ ∠BAD+∠ABC=1800
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【推荐1】如图,下列条件不能判定AB∥CD的是( )
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【推荐2】如图,将四边形纸片ABCD沿过点A的直线折叠,使得点B落在CD上的点Q处,折痕为AP.再将△PCQ,△ADQ分别沿PQ,AQ折叠,此时点C,D落在AP上的同一点R处.当AD=CP时,则
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