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数学7上：新数比原数的2倍少49，怎么求原数？一元一次方程应用题
数学7上：新数比原数的2倍少49，怎么求原数？一元一次方程应用题
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75/581
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