=1998.1998-1996.(1998+2)
=1998.1998-1996.1998+1996.2
=1998.(1998-1996)+1996.2
=1998.2+1996.2
=2.(1998+1996)
=2.3994
=7988
1998x1998-1996x2000=(1996+2)x1998-1996x(1998+2)=1996x1998+2x1998-1996x1998+1996x2=2x1998-1998x2=2x(1998-1996)=2x2=4
Tick nhé Tạ_Thu_Hiền
= 1998 . (1996 + 2 ) - 1996 . (1998 + 2 )
= 1998 . 1996 + 1998 . 2 - 1996 . 1998 + 1996 . 2
= ( 1998 . 1996 - 1996 . 1998) + 2 . (1996 + 1998)
= 0 + 2 . ( 1994 + 2000)
= 2 . 3994
= 7988
hoac = 2 . 1994 + 2. 2000
= 3988 + 4000
= 7988
tick nha ban , thanks
