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数学7上：代数式的倒数是1/3，怎么求x的值？一元一次方程常考题
数学7上：代数式的倒数是1/3，怎么求x的值？一元一次方程常考题
七年级数学上册，解一元一次方程，基础训练，培优考试真题105/176
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