=(9/25 + 16/25) + ( 2/11 + 9/11)+ (10/17 + 7/17)
= 1 + 1 + 1
= 3
Toán này đâu khó!
\(\dfrac{9}{25}+\dfrac{2}{11}+\dfrac{10}{17}+\dfrac{16}{25}+\dfrac{9}{11}+\dfrac{7}{17}\)
\(=\left(\dfrac{9}{25}+\dfrac{16}{25}\right)+\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\left(\dfrac{10}{17}+\dfrac{7}{17}\right)\)
\(=1+1+1\)
\(=3\)