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小学奥数：年龄问题，首先要想到年龄差不变，再根据倍数关系解题
数学思维训练课程（四年级上）1013：年龄问题，首先想到差不变
数学思维训练课程（四年级上）第10节10/13
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数学思维训练课程（四年级上）1013：年龄问题，首先想到差不变
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