知识点难度提升挑战《正负数加减法第2节100%英语版本》|双语学校收费数学课程抢先听

初中生|小学生|数学|中文英语双语教育|名师考点优选课

正负数加减法纯英文讲解版,如果觉得听起来有困难的同学可以从50%英文版本听起。逐渐的提高难度。

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