( 2012 * 99 - 1006 * 198 ) * 2013
= ( 1006 x 2 x 99 - 1006 x 198 ) x 2013
= ( 1006 x 198 - 1006 x 198 ) x 2013
= 0 x 2013
=0
( 2012 * 99 - 1006 * 198 ) * 2013
= ( 1006 x 2 x 99 - 1006 x 198 ) x 2013
= ( 1006 x 198 - 1006 x 198 ) x 2013
= 0 x 2013
=0
﴾ 2012 * 99 ‐ 1006 * 198 ﴿ * 2013
= ﴾ 1006 x 2 x 99 ‐ 1006 x 198 ﴿ x 2013
= ﴾ 1006 x 198 ‐ 1006 x 198 ﴿ x 2013
= 0 x 2013 =0