Question

19991999 * 1998 - 19981998 * 1999 = ?

Answer 1

19991999 x 1998 - 19981998 x 1999

= 1999 x 10001 x 1998 - 1998 x 10001 x 1999

= 0

Answer 2

19991999 * 1998 - 19981998 * 1999

=1999 * 10001 * 1998 - 1998 * 10001 * 1999

₌₀

Answer 3

19991999 * 1998 - 19981998 * 1999 = 1999*10001*1998-1998*10001*1999=0

Answer 4

19991999= 1999*1000+1999*1= 1999*10001

19981998=1998*1000+1998*1=1998*1001

suy ra : 1999*10001*1998-1998*10001*1999

=0

Answer 5

fgedbXHE%Tfdhnehjndfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfg = 0