(+8)+(-23)+(-8)+(+23)=?(-3/7)+(+1/5)+(+2/7)+(-1又1/5)=?

问题描述:

(+8)+(-23)+(-8)+(+23)=?(-3/7)+(+1/5)+(+2/7)+(-1又1/5)=?
1又3/4+(-6.5)+3又3/8+(-1.75)+2又5/8=?

(+8)+(-23)+(-8)+(+23)=8-23-8+23=0
(-3/7)+(+1/5)+(+2/7)+(-1又1/5)=-3/7+1/5+2/7-1+1/5=-1/7-1
1又3/4+(-6.5)+3又3/8+(-1.75)+2又5/8=1+3/4-6.5+3+3/8-1.75+2+5/8=1.75-6.5+3+0.375-1.75+2+0.625=-0.5