toán khó đây,giúp tui với@_@

T

tanngoclai

Ta có :

[TEX]\frac{\frac{12}{13} + \frac{12}{131} - \frac{12}{1313} + \frac{12}{13131}}{\frac{15}{13} + \frac{15}{131} - \frac{15}{1313} + \frac{15}{13131}}[/TEX]

[TEX]= \frac{12.(\frac{1}{13} + \frac{1}{131} - \frac{1}{1313} + \frac{1}{13131 )}}{15.( \frac{1}{13} + \frac{1}{131} - \frac{1}{1313} + \frac{1}{13131 ) }}[/TEX]

[TEX]= \frac{12}{15} = \frac{4}{5}[/TEX]
 
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