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基础代数/因式分解/章节测试
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来自维基教科书，一个自由的教科书集合
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Basic Algebra
请用这种方式发帖你的习题
习题:(答案，难度级别（容易，中等，难）)
例如 2x=6: (x=3,容易)
分类
:
教程:基础代数
华夏公益教科书
