2011 × 2010 - 1 / 2009 × 2011 + 2010
=2011 × 2009 + 2011 - 1 / 2009 × 2011 + 2010
= 2011 × 2009 + (2011 - 1) / 2009 × 2011 + 2010
= 2011 × 2009 + 2010 / 2009 × 2011 + 2010
= 1
tinh nhanh B=1/1+2009/2011+2009/2010 + 1/1+2010/2009+2010/2011 + 1/1+2011/2009+2011/2010
Chứng minh rằng :
(2010\(^{ }\)^2011- 2010^2010) chia hết cho 2009
tính tổng các số sau: -2012; -2011; -2010; -2009;...; -1; 0; 1; 2; 3; 4;...;2009; 2010; 2011; 2012
Cho A=2010+2010^2+2010^3+...+2010^2009+2010^2010.
CMR A chia hết cho 2011
Cho S = 2010+2010^2+2010^3 +....+2010^2009+2010^2010
Chứng tỏ S chia hết cho 2011
\(B=\frac{\frac{2008}{2011}+\frac{2009}{2010}+\frac{2010}{2009}+\frac{2011}{2008}+\frac{2012}{503}}{\frac{1}{2008}+\frac{1}{2009}+\frac{1}{2010}+\frac{1}{2011}}\)
Tính \(\frac{1}{2011}+\frac{2}{2010}+\frac{3}{2009}+...+\frac{2009}{3}+\frac{2010}{2}+\frac{2011}{1}\)
chứng minh 20092011+20112009 chia hết cho 2010
tính nhanh A= 4047991- 2010 x 2009/ 4050000-2011 x 2009
