还可以更简单些

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1008-0333|volume|6|25-26

ISSN: 1008-0333

Source: 数理化解题研究:初中版, Vol.volume, Iss.6, 2016-01, pp. : 25-26

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Abstract