069 ㄧ元一次方程式 13：-x = b (x 是負整數) | 熱血教師 | 均一教育平台

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069 ㄧ元一次方程式 13：-x = b (x 是負整數)

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069 ㄧ元一次方程式 13：-x = b (x 是負整數)