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如图,若正方形A1B1C1D1内接于正方形ABCD的内接圆,则的值为( ) A....
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如图,若正方形A
1B
1C
1D
1内接于正方形ABCD的内接圆,则
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的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194107837263558/SYS201311011941078372635009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194107837263558/SYS201311011941078372635009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194107837263558/SYS201311011941078372635009_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194107837263558/SYS201311011941078372635009_ST/4.png)
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用换元法解方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194107837263558/SYS201311011941078372635006_ST/0.png)
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