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小学数学西师版教材第五册开始学习分数,在初步认识分数后,就要学习简单的分数加减法,即同分母分数加减法。在上课时,我让每个孩子将自己准备的纸条分出2/7,再分出这个纸条的3/7,然后提问一共分出几分之几
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