既重“估”,也重“算”——以人教版二年级上册《加、减法的估算》教学为例

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1001-8875|volume|34|24-25

ISSN: 1001-8875

Source: 数学教学通讯, Vol.volume, Iss.34, 2016-01, pp. : 24-25

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Abstract