(-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)=
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