(-39/8)-(-11/2)+(-17/4)-(+25/8)=

问题描述:

(-39/8)-(-11/2)+(-17/4)-(+25/8)=

(-39/8)-(-11/2)+(-17/4)-(+25/8)=-39/8+11/2-17/4-25/8=-64/8 +5/4 =-8+2-3/4 =-6又3/4