Question

tính: 1/2000+2001+1/2001+2002+1/2002+2003+...+1/2009+2010

Answer 1

=1/2000-1/2001+1/2001-1/2002+1/2002-1/2003+......+1/2009-1/2010

=1/2000-1/2010

=1/402000

Answer 2

\(\frac{1}{2000+2001}+\frac{1}{2001+2002}+\frac{1}{2002+2003}+...+\frac{1}{2009+2010}\)

\(=\frac{1}{2000}-\frac{1}{2001}+\frac{1}{2001}-\frac{1}{2002}+\frac{1}{2003}-\frac{1}{2003}+...+\frac{1}{2009}-\frac{1}{2010}\)

\(=\frac{1}{2000}-\frac{1}{2010}\)

\(=\frac{1}{402000}\)