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基礎代數/因式分解/章節測試
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來自華夏公益教科書，一個自由的教科書集合
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Basic Algebra
請用這種方式發帖你的習題
習題:(答案，難度級別（容易，中等，難）)
例如 2x=6: (x=3,容易)
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教程:基礎代數
華夏公益教科書
