2005 x 2007 - \(\frac{1}{2004}\)+ 2005 x 2006
= 4024035 - \(\frac{1}{2004}\)+ 4022030
= 4024035 + 4022030
= 8046065
\(\frac{2005.2007-1}{2004+2005.2006}=\frac{2005.2006+2005-1}{2004+2005.2006}=\frac{2005.2006+2004}{2004+2005.2006}=1\)
K CHO MIK NHA!