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数学7上：年龄问题，如何列一元一次方程，求出父子年龄各是多少
数学7上：年龄问题，如何列一元一次方程，求出父子年龄各是多少
七年级数学，一元一次方程应用题，各种类别的题型，这里都有详解187/581
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