(11*10*9*.*3*2*1)/(22*24*25*27)

问题描述:

(11*10*9*.*3*2*1)/(22*24*25*27)
简便计算.

(11*10*9*.*3*2*1)/(22*24*25*27)
=[(11*2)(2*5*5)(9*3)8*7(6*4)*1]/22*24*25*27
=2*8*7*1
=16*7
=112