9/(9/8)/8/(8/7)/7/(7/6)/6/(6/5)/5/(5/4)/4/(4/3)
=9/9*8/8/8*7/7/7*6/6/6*5/5/5*4/4/4*3
=1*1/8*1/7*1/6*1/5*1/4*3
=3/(4*5*6*7*8)
=1/2240
9/(9/8)/8/(8/7)/7/(7/6)/6/(6/5)/5/(5/4)/4/(4/3)用简便方法记算
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