(1.75-0.875-7/12)/(-7/8)+(-7/8)/(1.75-0.875一7/12)简便

问题描述:

(1.75-0.875-7/12)/(-7/8)+(-7/8)/(1.75-0.875一7/12)
简便

(1.75-0.875-7/12)/(-7/8)+(-7/8)/(1.75-0.875-7/12)
=-1+2/3-1+2/3
=-2/3