4,2,1,1/2,1/4,(1/8),(1/16),(1/32) 前一个数是后一个的2倍1/2,1/6,1/12,1/20,1/30,1/42,(1/56),(1/72),(1/90)分母依次为2=1×26=2×312=3×420=4×530=5×642=6×756=7×872=8×990=9×10...
4,2,1,1/2,1/4,(),(),() 1/2,1/6,1/12,1/20,1/30,42/1,(),(),()
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