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	3	chỉnh		Sửa 15-12-15 03:56 PM ๖ۣۜJinღ๖ۣۜKaido 1
???ai giúp mk với $\frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.$ Chỉnh hợp ???ai giúp mk với $\frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.$ Chỉnh hợp ???ai giúp mk với $\frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.$ Chỉnh hợp

	2	thêm 2 ký tự trong đề bài
???ai giúp mk với $\frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.$ Chỉnh hợp ???ai giúp mk với \frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right. Chỉnh hợp ???ai giúp mk với $\frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.$ Chỉnh hợp

	1	tạo mới		Hỏi 14-12-15 08:43 PM shinjadoo 1
???ai giúp mk với \frac{1}{1C2009} + \frac{1}{2C2009} +....+\frac{1}{2009C2009}=\frac{1005}{2009}\left[ {\frac{1}{0C2009 +...+\frac{1}{2008C2008}}} \right.

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