Tính:1/2+(16/21+27/13)-(14/13-5/21)

* Hướng dẫn giải

$\frac{1}{2}+\left(\frac{16}{21}+\frac{27}{13}\right)-\left(\frac{14}{13}-\frac{5}{21}\right)=\frac{1}{2}+\frac{16}{21}+\frac{27}{13}-\frac{14}{13}+\frac{5}{21}=\frac{1}{2}+1+1=\frac{5}{2}$