Tính nhanh: (2006x125+1000)/(126x2005-888

* Hướng dẫn giải

$$\begin{gathered} \frac{2006\times 125+1000}{126x2005-888}=\frac{\left(2005+1\right)x125+1000}{2005\times \left(125+1\right)-880} \\ =\frac{2005\times 125+125+1000}{2005\times 125+2005-880} \\ =\frac{2005\times 125+1125}{2005\times 125+1125} \\ =1 \end{gathered}$$