1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
1996 * 1995 - (996 + 1000 + 1996*1996)
= 1996*1995 - (1996 x (1 + 1996))
= 1996*(1995 - 1996 - 1)
= 1996* -2
=-3992
1996 x 1995 - 996
------------------------- : 7/5
1000 + 1996 x 1994
Tính nhanh \(\frac{1996\times1995-996}{1000+1996\times1994}=?\)
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
so sánh A và B
A = 1995/1996 + 1996/1997
B = (1995 +1996)/(1996 +1997)
1988×1996+1997×11+1985/1997×1996-1995×1996
1998*1996+1997*11+1985
1997*1996-1995*1996
( -1997 ) . 1996 + 1/ (-1995). (-1997) +1996
rút gọn
-1997*1996+1/-1995*(-1997)+1996
rút gọn phân số sau -1997 . 1996 + 1 / (-1995) . (-1997)+ 1996