算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程

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算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程

算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程
算数题 求解
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8
要过程

算数题 求解1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/7X8要过程
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6++1/6×7+1/7X8
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6++1/6-1/7+1/7-1/8
=1/2-1/8
=3/8

2+3/2+4/3+5/4+6/5+8/7=?