原式=[1*(1-1/返友衡2)]*[2*(1-1/3]*[3*(1-1/4]*……告老*[9*(1-1/10)]
=1*2*……*9*(1-1/漏做2)(1-1/3)……(1-1/10)
=1*2*……*9*(1/2)*(2/3)*……(9/10)
(1/2)*(2/3)*……(9/10)中间约分约去
所以原式=1*2*……*9*(1/10)
=36288
(1-1/2)*(友模歼2-2/3)*(3-3/4)*(4-4/5)*(5-5/6)*(6-6/7)*(7-7/8)*(8-8/9)*(9-9/10)
=1/2*2*2/3*3*3/4*4*4/5*5*5/6*6*6/码神7*7*7/8*8*8/好冲9*9*9/10=1*2*3*4*5*6*7*8*9/10
=3*4*6*7*8*9=36288