1/2×3+1/3×4+1/5×4……1/98×99+1/99×100=?

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1/2×3+1/3×4+1/5×4……1/98×99+1/99×100=?

1/2×3+1/3×4+1/5×4……1/98×99+1/99×100=?
1/2×3+1/3×4+1/5×4……1/98×99+1/99×100=?

1/2×3+1/3×4+1/5×4……1/98×99+1/99×100=?
=98+1/2+1/3+···+1/99
=97+1+1/2+1/3+···+1/99
=97+ln(99)