Đáp án:
Giải thích các bước giải:
A=1−1/2+1/3−1/4+...+1/99−1/100
A=(1+1/3+...+1/99)−(1/2+1/4+...+1/100)
A=(1+1/3+...+1/99)−(1/2+1/4+...+1/100)
A=(1+1/2+1/3+...+1/99+1/100)−2(1/2+1/4+...+1/100)
A=(1+1/2+1/3+...+1/99+1/100)−2(1/2+1/4+...+1/100)
A=(1+1/2+1/3+1/4+....+1/99+1/100)−(1+1/2+...+1/50)
A=(1+1/2+1/3+1/4+....+1/99+1/100)−(1+1/2+...+1/50)
A=1/51+1/52+...+1/100