Question

Tính hợp lí ( nếu có thể )

1998 . 1998 - 2000 . 1996

Answer 1

1998 . 1998  -  2000 . 1996

= ( 1996 + 2 ) . 1998  - ( 1998 + 2 ) .1996

= 1996 . 1998 + 2.1998 - 1998 . 1996 - 2 . 1996

= 1996.1998 -1998.1996 + 2.1998 - 2.1996

= 2.1998 - 2.1996

= 2.( 1998-1996)

= 2. 2

= 4

Hok tốt !!!

Answer 2

1998 . 1998 - 2000 . 1996

=1998\(^2\)- ((1998+2).1996)

=1998\(^2\)- (1998.(2+1996))

=1998\(^2\)- 1998\(^2\)

=0