1998 x 1996 + 1997 x 11 + 1985
= 3988008 + 21967 + 1985
= 4009975 + 1985
= 4011960
b. 1997 x 1996 - 1995 x 1996
= 1996 x (1997 - 1995)
= 1996 x 2
= 3992
1988×1996+1997×11+1985/1997×1996-1995×1996
so sánh A và B
A = 1995/1996 + 1996/1997
B = (1995 +1996)/(1996 +1997)
( -1997 ) . 1996 + 1/ (-1995). (-1997) +1996
So sánh bt A=1996/1997+1997/1998 với B=1996+1997/1997+1998
a) A=1-2-3+4+5-6-7+.....+1996+1997-1998-1999+2000
b) B=1-3+5-7+....+2001-2003+2005
c) C=1-2-3+4+5-6-7+8+.....+1993-1994-1995+1996+1997
d) D=1000+998+996+......+10-999-997-995-...-11
rút gọn
-1997*1996+1/-1995*(-1997)+1996
rút gọn phân số sau -1997 . 1996 + 1 / (-1995) . (-1997)+ 1996
-1997*1996 +1
-1995*(-1997)+1996
rut gon phan so:
-1997*1996+1/(-1995)*(-1997)+1996
