1/1X2+1/2X3+1/3X4+...+1/99+100=
问题描述:
1/1X2+1/2X3+1/3X4+...+1/99+100=
答
题目给错了吧?最后一项应该是1/99X100吧?
1/1X2+1/2X3+1/3X4+...+1/99X100
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)
=1-1/100
=99/100