如图,已知圆O的半径为r,弦AB垂直平分半径OC,则弦AB长为
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圆O的直径为10cm,弦AB垂直平分半径OC,则弦AB的长为多少
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证明:对椭圆内的任意一点p,存在过p的一条弦,使p是弦的中点
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你能帮帮他们吗
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标有abcdefgh记号的八盏灯,顺次排成一行,每盏灯装有一个开关,现在beg开着,其余五盏灯是关着的,小明从a 开始逐个拉动,2006次后,关着的灯是
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