(1/2003+1/2004-1/2005)/(5/2003+5/2004-5/2005)-(2/2002+2/2003-2/2004)/(3/2002+3/2003-3/2004)
Tính A= 1+ 2+ 2^2+ 2^3+ 2^4+...+ 2^2004- 2^2005
Tính A= 1+ 2+ 2^2+ 2^3+ 2^4+...+ 2^2004- 2^2005
[(1/2)+(1/3)+(1/4)+(1/5)+...+(1/2005)]/[(2004/1)+(2003/2)+(2002/3)+...+(1/2004)]
D=1/2 +1/3+1/4+...+1/2005:2004/1+2003/2+2002/2+...1/2004
1, CMR
1/3+1/32+1/33+1/34+...+1/32004+1/32005 <1/2
2, CMR
1-1/22-1/32-1/42-...-1/20042 >1/2004
Bài 2 : Tính : B = \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2005}}{\frac{2004}{1}+\frac{2003}{2}+\frac{2002}{3}+...+\frac{1}{2004}}\)
Tính : P = \(\frac{\frac{1}{2003}+\frac{1}{2004}+\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
1+2+2^2+2^3+.....+2^2004-2^2005
