(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)= (-6)-(-5)-(-6)= (-6又1/8)+3.125)=(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)=

(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)= (-6)-(-5)-(-6)= (-6又1/8)+3.125)=(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)=
(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)=
(-6)-(-5)-(-6)= (-6又1/8)+3.125)=
(-2.75)+(4又1/4)+(-2又3/8）+5/8=
(-20.75)+3又1/4+(-4.25)+(+19又 3/4)=

(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)= (-6)-(-5)-(-6)= (-6又1/8)+3.125)=(-2.75)+(4又1/4)+(-2又3/8）+5/8= (-20.75)+3又1/4+(-4.25)+(+19又 3/4)=
(-2.75)+(4又1/4)+(-2又3/8）+5/8=
= 1.5-1.75
= -0.25
(-20.75)+3又1/4+(-4.25)+(+19又 3/4)=
= -1-1
= -2
(-6)-(-5)-(-6)
= -6+5+6
=5
(-6又1/8)+3.125)
= -6.125+3.125
= -3