Question

1997 x 1996 - 995
_______________
1995 x 1997 + 1002       Tính nhanh

Answer 1

\(∘Anya\)

\(=\dfrac{\text{1997 × 1996 − 995}}{\text{1995 × 1997 + 1002 }}\)

\(=\dfrac{\text{1997 × ( 1995 + 1 ) − 995}}{\text{1995 × 1997 + 1002}}\)

\(=\dfrac{\text{1997 × 1995 + 1997 − 995}}{\text{1995 × 1997 + 1002}}\)

\(=\dfrac{\text{1997 × 1995 + 1002}}{\text{1995 × 1997 + 1002 }}=1\)