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三年级数学，培优题，提高题。学会画图分析，优生成长的第一步。
三年级数学，培优题，提高题，一个正方形如果把边长减少3cm，那么面积就减少39平方厘米。原正方形的面积是多少平方厘米？
人教版三年级数学下册，典型题、易错题、培优题(与教材同步）53/95
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