1/2 + 3/4x = 1/4 5/3 - 4/3x = 1/2 5/6 +1/6 : x = -2 2/3x + 5/4=-1/12 (1/2-1)(1/3-1)(1/4-1)...(1/2008-1)(1/2009-1)

Các câu hỏi liên quan