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假如小蚂蚁在如图所示的地砖上自由爬行,它最终没有停在黑色方砖上的概率为( ) A...
假如小蚂蚁在如图所示的地砖上自由爬行,它最终没有停在黑色方砖上的概率为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236025_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236025_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236025_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236025_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102205841323646/SYS201311031022058413236025_ST/3.png)
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A.
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B.
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D.
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B.0
C.
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D.
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“赵爽弦图”是四个全等的直角三角形与中间一个小正方形拼成的大正方形.如图,是一“赵爽弦图”飞镖板,其直角三角形的两条直角边的长分别是2和4.小明同学距飞镖板一定距离向飞镖板投掷飞镖(假设投掷的飞镖均扎在飞镖板上),则投掷一次飞镖扎在中间小正方形区域(含边线)的概率是( )
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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