1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)+…+1/(98×99)+1/(99×100)0U/~0]'Z6b)g1s
算式:提示9O/|2@3x/P*p7P8l,^8H8a4I+L0U/~0]'Z6b)g1s
=6W.Y)u*U)H8e5B.L/i+_:d*j4{0U/~0]'Z6b)g1s