Question

   

B1:Tính nhanh

1997 x 1996 - 1 / 1995 x 1997 +1996

Mình xin câu trả lời đúng nhất nhaa 

Answer 1

\(\dfrac{1997\times1996-1}{1995\times1997+1996}\)

= \(\dfrac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}\)

= \(\dfrac{1997\times1995+1997-1}{1995\times1997+1996}\)

= \(\dfrac{1995\times1997+1996}{1995\times1997+1996}\)

= 1