Tính nhanh (9/16 + 8/-27) + (1 + 7/16 + -19/27)

* Hướng dẫn giải

$\left(\frac{9}{16}+\frac{8}{-27}\right)+\left(1+\frac{7}{16}+\frac{-19}{27}\right)=\left(\frac{9}{16}+\frac{7}{16}\right)+\left(\frac{8}{-27}+\frac{-19}{27}\right)+1$$=1-1+1=1$