Question

Tính nhanh 
\(\dfrac{1996\cdot1997+1998\cdot3+1994}{1997\cdot1999-1997\cdot1997}\)

Answer 1

\(\dfrac{1996\cdot1997+\left(1997+1\right)\cdot3+1994}{1997\cdot\left(1999-1997\right)}\) =  \(\dfrac{1996\cdot1997+3\cdot1997+1997}{1997\cdot2}\)

\(\dfrac{1997\cdot\left(1996+3+1\right)}{1997\cdot2}\)        =    \(\dfrac{2000}{2}\)=   \(1000\)