S=2-4+6-8+2008-2010
= (2-4)+(6-8)+(2008-2010)
=-2+-2+-2
=-2.3
=-6
S=2-4+6-8+2008-2010
S=(2-4)+(6-8)+(2008-2010)
S=-2+(-2)+(-2)
S=-6
S=2-4+6-8+2008-2010
= (2-4)+(6-8)+(2008-2010)
=-2+-2+-2
=-2.3
=-6
S=2-4+6-8+2008-2010
S=(2-4)+(6-8)+(2008-2010)
S=-2+(-2)+(-2)
S=-6
s=1+2-3-4+5+6-7-8+9+...+2006-2007-2008+2009+2010
tính s
S=1+2-3-4+5+6-7-8+9+...+2006-2007-2008+2009+2010
Tính
A=1-2+3+4-5-6+7+8-9-.....+2007+2008-2009-2010
B=2^2005-2^2003-2^2001-......-2-1
C=2+4+4+8+10-12-14+16+......-2006+2008+2010-2012
D=1-2-3-4+5-6-7-8+9-10-11-......-2010
tinh tong
a)s=1+(-2)+3+(-4)+.......+2009+(-2010)
b)s=1+(-2)+(-3)+4+5+6(-6)+(-7)+......+2008+2009+(-2010)
4/2*4+4/4*6+4/6*8+...+4/2008*2010
C = 4 / 2 nhan 4 + 4 / 4 nhan 6 + 4 / 6 nhan 8 + ... + 4 / 2008 nhan 2010
tính tổng : 0-2+4-6+8-10+12-14+...+2008-2010
1-2+3+4-5-6+7+8-9-...+2007+2008-2009-2010
Tính A=1+2-3-4+5+6-7-8+....-2007-2008+2009+2010