Question

数学题，急急急

用规律计算(-1x1/2)+(-1/2x1/3)+(-1/2013x1/2014)

Answer 1

=-(1-1/2+1/2-1/3+...+1/2013-1/2014)
=-(1-1/2014)
=-2013/2014

Answer 2

=-(1/1×2+1/2×3+1/3×4+……+1/2013×2014)
=-(1-1/2+1/2-1/3+1/3-1/4+……+1/2013-1/2014)
=-(1-1/2014)
=-2013/2014