G
girlhay99


Rút gọn:
A =[TEX]\frac{\frac{1}{a}+\frac{2}{a-1}+\frac{3}{a-2}+...+\frac{a-1}{2}+\frac{a}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{a-1}+\frac{1}{a}+\frac{1}{a+1}}[/TEX]
Sẽ bấm thanks nếu ai giải được!
A =[TEX]\frac{\frac{1}{a}+\frac{2}{a-1}+\frac{3}{a-2}+...+\frac{a-1}{2}+\frac{a}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{a-1}+\frac{1}{a}+\frac{1}{a+1}}[/TEX]
Sẽ bấm thanks nếu ai giải được!
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