发布时间:2025-01-29 17:46:02
椭圆周长公式:L=2πb+4(a-b)
椭圆周长定理:椭圆的周长等于该椭圆短半轴长为半径的圆周长(2πb)加上四倍的该椭圆长半轴长(a)与短半轴长(b)的差。
rad丨0srf220型号的索尼_珍收音机的价格是日本原产的吗
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