$C^{a}_{b}88/56+C^{a}_{b}89/72+C^{a}_{b}810/90+\begin{matrix} a & b\\ c & d \end{matrix}+C^{a}_{b}82012/2011*2012$
giúp em bài này với ạ –  thuongsmart 18-11-16 07:15 PM

bị xóa vì bị trùng bởi thuongsmart@gmail.com, ๖ۣۜDevilღ 20-11-16 12:57 AM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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