Question

Tính nhanh biểu thức sau :

1990 x 1990 -1992 x 1988

Answer 1

     \(1990\times1990-1992\times1988\)

 \(=\left(1988+2\right)\times1990-\left(1990+2\right)\times1988\)

  \(=1988\times1990+2\times1990-1990\times1988-2\times1988\)

  \(=2\times1990-2\times1988\)

  \(=2\times\left(1990-1988\right)\)

  \(=2\times2\)

   \(=4\)