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数学7上：若y=3是方程的解，怎么求代数式的值？一元一次方程的解
数学7上：若y=3是方程的解，怎么求代数式的值？一元一次方程的解
七年级数学上册，解一元一次方程，基础训练，培优考试真题118/176
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