冀教版四年级数学下册教案{完整版}-(7084).docx

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7、-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------课时计划第9题，照下面的样子，把一张正方形纸对折一次可以得到两个三

8、角形⋯⋯根据自己对折的结果完成下表对折次数（次）1234⋯⋯n三角形个数（个）2⋯⋯每个三角形面积占正⋯⋯课方形面积的几分之几堂练（1）这些分数有什么特点？习小（2）这组分数中第6个分数是几分