【學測】093 填充H 圓上與原點距離為整數| 直線與圓| 均一教育 ...

Junyi Academy is derived originally from Khan Academy, and derived from Chengzhi Foundation.More information about Chengzhi Foundation, you can find under: http://kistschool.org/.More information about Khan Academy, you can find under: https://www.khanacademy.org/.