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
Bài 1:Tính tổng :
1.D=1+3-5+7+.........+2011
2.E=2-4+6-8+..........+2006-2008+2010-2012
3.F=2-4-6+8+810-12-14+16+...................+98-200-102+104
4.H=1+2-3-4+5+6-7-8+9+10-11-12+....................-111-112+113+114
Tính :
A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 +....+ 2006 - 2007 - 2008 + 2009 - 2010 - 2011 - 2012
Tính nhanh:
a, 27 x 332 + 68 x 27 + 73 x 332 + 68 x 73
b, -2 + 4 + 6 - 8 - 10 + 12 + 14 - 16 - ... - 2002 + 2004 + 2006 - 2008 - 2010
b=2-4-6+8+10-12-14+16+...+2002-2004-2006+2008
tính nhanh A =2-4-6+8+10-12-14+16+...+2002-2004-2006+2008
Tính tổng: \(0-2+4-6+8-10+12-14+...+2008-2009+2010-2012\)
tinh gia tri bieu thuc:
-1-2+3+4-5-6+7+8-9-10+11+12-...-2013-2014+2015+2016
Tính:
B= - 2 + 4 + 6 - 8 - 10 +12 +14 - 16 - 18 +...- 2010 + 2012