Question

[Nguyễn Thái Tuấn]

Rút gọn: 4000/1+3999/2+3998/3+...+1/4000 / 1/2+1/3+1/4+...+1/4001

Answer 1

[Tâm Trần Ngọc]

A=[(3999/2+1)+(3998/3+1)+...+(1/4000+1)+1]/(1/2+1/3+...+1/4001)

A=(4001/2+4001/3+...+4001/4001)/(1/2+1/3+...+1/4001)

A=[4001(1/2+1/3+...+1/4001)]/(1/2+1/3+...+1/4001)

A=4001

Vậy A=4001