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dangtri85.2017.2018
2 năm trước
b)|-x|=-x c)|x|<bằng x d)x-|-x|=0 Tính|x| a) (1-1/2).(1-1/3).(1-1/4)...(1-/100)+x=2 1/5 b)1.2+2.3+3.4+...+99.100=2 1/5.x-1 Helpppp meeeee ! Cần gấp
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