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三年级数学，培优题，延伸题，学霸测试题，你是学霸吗？
三年级数学，培优题，延伸题，由16个小方格组成的四行四列的图形中，一共有几个正方形？
人教版三年级数学下册，典型题、易错题、培优题(与教材同步）49/95
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