Question

Tính nhanh :

\(\dfrac{13}{17}+\dfrac{2}{13}+\dfrac{4}{17}+.......+\dfrac{11}{13}\)

Answer 1

..... làm j thế

Answer 2

( \(\dfrac{13}{17}\) + \(\dfrac{4}{17}\) ) + (\(\dfrac{2}{13}\) + \(\dfrac{11}{13}\) ) = \(\dfrac{17}{17}\) + \(\dfrac{13}{13}\) = \(1\) + \(1\) = \(2\).