Tính nhanh (-5/12 + 6/11) + (7/17 + 5/11 + 5/12)

* Hướng dẫn giải

$\left(\frac{-5}{12}+\frac{6}{11}\right)+\left(\frac{7}{17}+\frac{5}{11}+\frac{5}{12}\right)=\left(\frac{-5}{12}+\frac{5}{12}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\frac{7}{17}$$=0+1+\frac{7}{17}=\frac{24}{17}$