Question

计算1＼1×2+1＼2×3+1＼3×4+……+1＼49×50要简便计算,有过程更好,急用

Answer 1

1＼1×2+1＼2×3+1＼3×4+……+1＼49×50

=1-1/2+1/2-1/3+1/3-1/4+……+1/49-1/50

=1-1/50

=49/50