设1*2*3=3!1*2*3*4=4!…… 1/35!-1/36!=1/36!*x,x应该是

问题描述:

设1*2*3=3!1*2*3*4=4!…… 1/35!-1/36!=1/36!*x,x应该是

1/35!-1/36!=1/36!*x
1/(1*2*3...35)-1/(1*2*...36)=36/(1*2*...36)-1/(1*2...36)=(36-1)/36!=35/36!=1/36!*x
x=35