2.75-[（-1/2）-（-5/6）+（-3/8）] +4又2/3
=4分之11-[（-1/2）+5/6 - 3/8）] +3分之14
=11/4-（-1/24）+14/3
=66/24+1/24+112/24
=179/242.75-[（-1/2）-（-5/6）+（-3/8）+4又2/3] =?2.75-[（-1/2）-（-5/6）+（-3/8）+4又2/3] =11/4-[（-1/2）+5/6 - 3/8+14/3]=11/4-[（-12/24)+20/24-9/24+112/24]=11/4-37/8=(-15/8)=(-1又8分之7）(-4)-(-2)-﹛(-5)-[(-7)+(-3)-（-8）]﹜=？|3-4|+(-5-8)-|-1+5|-(5-20)=？(-4)-(-2)-﹛(-5)-[(-7)+(-3)-（-8）]﹜=(-2)-[(-5)-(-2)]=(-2)-(-3)=1|3-4|+(-5-8)-|-1+5|-(5-20)=|(-1)|+(-13)-|+4|-(-15)=1-13-4+15=(-1)