(-2又3/4)+1又2/3+0.75+(+1/8)+(-3.125)
=(-2.75)+1又2/3+0.75+(+0.125)+(-3.125)
=[(-2.75)+0.75]+[(+0.125)+(-3.125)]+1又2/3
=-2-3+1又2/3=-10/3
(-2又3/4)+1又2/3+0.75+(+1/8)+(-3.125)
=(-2.75)+1又2/3+0.75+(+0.125)+(-3.125)
=[(-2.75)+0.75]+[(+0.125)+(-3.125)]+1又2/3
=-2-3+1又2/3=-10/3