Question

二分之一加二乘三分之一加三乘四分之一加……加九十九乘以百分之一

Answer 1

1/2 +2*1/3 +3*1/4+……+99*1/100

=(1-1/2)+(1-1/3)+(1-1/4)+……+(1-1/100)

=1*99-(1/2+1/3+1/4+……+1/100)

=99-(1/2+1/3+1/4+……+1/100)

貌似无法化简