如图在半径为r的圆内作内接正六边形再作正六边形的内切圆又在此内切圆内作内接正六边形如此无限继续下去设sn为前n个圆的面积之和则 A Template




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tomski如图在半径为r的圆内作内接正六边形再作正六边形的内切圆又在此内切圆内作内接正六边形如此无限继续下去设sn为前n个圆的面积之和则 a coloring