5*6*7*8分之5*6*7*8-2*3*4*5 简算

问题描述:

5*6*7*8分之5*6*7*8-2*3*4*5 简算

(5*6*7*8-2*3*4*5)/5*6*7*8
=5*6*7*8/5*6*7*8-2*3*4*5/5*6*7*8
=1-1/14
=13/14