Bài 1:Tìm x
2+\(\frac{2}{6}\)+\(\frac{2}{12}+\frac{2}{20}+........+\frac{2}{x\left(x+1\right)}=1\frac{2005}{2007}\)
Bài 2 :So sánh
a,\(\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2003}\)với 3
b,\(\frac{2005.2006}{2005.2006+1}\)và \(\frac{2006.2007}{2006.2007+1}\)