计算1/5x6+1/6x7+1/7x8+1/8x9+...+1/47x48+1/48x49+1/

9x50

原式=1/5-1/6+1/6-1/7+1/7-1/8+.....+1/48-1/49+1/49-1/50
=1/5-1/50
=9/50
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