1:
原式=0-1/2-(-3/4)+(-5/6)-2/3=-1/2+3/4-5/6-2/3=1/4-5/6-4/6=1/4-3/2=-4/5
2:
原式=2.5+2.5+1-|1-2.5|=6-1.5=4.5
3:
13-[26-(-21)+(-18)]=13-(26+21-18)=13-29=-16
4:
[1.4-(-3.6+5.2)-4.3]-(-1.5)=1.4-1.6-4.3+1.5=-0.2-4.3+1.5=-4.5+1.5=-3
1:
原式=0-1/2-(-3/4)+(-5/6)-2/3=-1/2+3/4-5/6-2/3=1/4-5/6-4/6=1/4-3/2=-4/5
2:
原式=2.5+2.5+1-|1-2.5|=6-1.5=4.5
3:
13-[26-(-21)+(-18)]=13-(26+21-18)=13-29=-16
4:
[1.4-(-3.6+5.2)-4.3]-(-1.5)=1.4-1.6-4.3+1.5=-0.2-4.3+1.5=-4.5+1.5=-3