Question

65,39 x 54 - 52 x 65,39 -65,39 

=

=

= 

(tính bằng cách thuận tiện)

 

Answer 1

\(65,39\times54-52\times65,39-65,39\)

\(=65,39\times\left(54-52-1\right)\)

\(=65,39\times1\)

\(=65,39\)

Answer 2

  65,39 x 54 - 52 x 65,39 -65,39 

= 65,39 x 54 - 52 x 65,39 - 65,39 x1 

=65,39 x ( 54 - 52 - 1 )

=65,39 x 1 

=   65,39