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Gửi tăng các bạn 99 bài toán liên quan cực trị hàm sô !
http://www.mediafire.com/download/c40q4yqu5s2ib40/99-bt-lien-quan-cuc-tri-ham-so.zip
http://www.mediafire.com/download/c40q4yqu5s2ib40/99-bt-lien-quan-cuc-tri-ham-so.zip