一副直角三角板如图放置,已知
,
,
,AB//DE,则
( )
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988617472868352/2991457031962624/STEM/eac1a84f-79ec-45a0-9bff-05ee67349d75.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336eec58e134c64d47f26ec26146c091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4a288554fe25fe0a72530eb29756e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988617472868352/2991457031962624/STEM/eac1a84f-79ec-45a0-9bff-05ee67349d75.png?resizew=192)
A.60° | B.65° | C.70° | D.75° |
更新时间:2022-05-31 21:17:49
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【推荐1】如图,B处在A处的南偏西
方向,C处在A处的南偏东
方向,C处在B处的北偏东
方向,则
等于( )
![](https://img.xkw.com/dksih/QBM/2022/11/23/3116019160907776/3117442696790016/STEM/1a63568a97ee419fa2c7568618809e2e.png?resizew=132)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图所示,AB//CD,AD与BC相交于点E,EF是∠BED的平分线,若∠1=30°,∠2=40°,则∠BEF=( )
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933350306062336/2973023643901952/STEM/f471b58c-2dc9-4c60-bb3a-a1efaeda9947.png?resizew=137)
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933350306062336/2973023643901952/STEM/f471b58c-2dc9-4c60-bb3a-a1efaeda9947.png?resizew=137)
A.70° | B.40° | C.35° | D.55° |
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【推荐1】将一副三角尺按如图摆放,点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c3b7126cf88089169528b7ff49551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d387bfdf1885986c8c0e79da8ff9b6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35da048d287bbfae5bd2205aefb86379.png)
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【推荐2】如图所示,正五边形
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