1998 x 497 +1998 x 1 + 1998 x 1 + 1998 x1
= 1998 x (497+1+1+1)
=1998 x500 = 999000
1998x497+1998+1998+1998
= 1998 x 497 + 1998 x 3
= 1998 x (497+3)
= 1998 x 500
= 999000
1998x497+1998+1998+1998
=1998x497+1998x3
=1998x(497+3)
=1998x500
=999000
HỌC TỐT NHÉ!
1998 x 497 + 1998 + 1998 + 1998
= 1998 x 497 + 1998 x 3
= 1998 x ( 497 + 3 )
= 1998 x 500
= 999000