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七年级数学：怎么求原来的两位数是多少？一元一次方程，数字问题
七年级数学：怎么求原来的两位数是多少？一元一次方程，数字问题
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499/581
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