Tài liệu không thống nhất
Hướng dẫn ôn thi tốt nghiệp THPT môn toán năm 2008 -2009 của NXB Giáo dục và Tài liệu hướng dẫn ôn tập tốt nghiệp cho các môn năm 2009 của Bộ GD&ĐT có nhiều điểm không thống nhất.
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