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如图所示:两个同心圆,半径分别是和,矩形ABCD边AB,CD分别为两圆的弦,当矩...
如图所示:两个同心圆,半径分别是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845006_ST/0.png)
和
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,矩形ABCD边AB,CD分别为两圆的弦,当矩形ABCD面积取最大值时,矩形ABCD的周长是
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845006_ST/images2.png)
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