tính C=2010/1+2009/2 + 2008/3 +...+ 1/2010:1\2+1/3+1/4+......+1\2011
Cho A = 1/2001+2/2009+3/2008+........2009/+ 2010/1, B = 1+1/2+1/3+1/4+1/5+1/6+.......1/2010+1/2011. Tính A/B
Tinh\(\frac{\frac{2010}{1}+\frac{2009}{2}+\frac{2008}{3}+...+\frac{2}{2009}+\frac{1}{2010}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2010}+\frac{1}{2011}}\)
Tính :
\(C=\frac{\frac{2010}{1}+\frac{2009}{2}+\frac{2008}{3}+....+\frac{1}{2010}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+....+\frac{1}{2011}}\)
Bài 5:1/2+1/3+...+1/2008).x=2009/1+2010/2+2011/3+5016/2008-2008
(2008 x 2009 x 2010 x 2011) x (1 + 1/2 : 3/2 - 4/3)
1-2-3+4+5-6-7+...+2008+2009-2010-2011
\(B=\frac{\frac{2008}{2011}+\frac{2009}{2010}+\frac{2010}{2009}+\frac{2011}{2008}+\frac{2012}{503}}{\frac{1}{2008}+\frac{1}{2009}+\frac{1}{2010}+\frac{1}{2011}}\)
cho A=\(\frac{1}{2010}+\frac{2}{2009}+\frac{3}{2008}+...+\frac{2009}{2}+\frac{2010}{1}\)
B=\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2010}+\frac{1}{2011}\)
tính\(\frac{a}{b}\)
b.giả sử 2^2010 có m chữ số và 5^2010 có n chữ số.tính m+n
So sánh các số
a) 2009/2010 và 2010/2011
b) 200/201+ 201/202 và 200+201/201+202
c) 1/3^400 và 1/4^300
d) 2008/2008× 2009 và 2009/2009×2010