1）.3/1+（—6/5） 2).27-18+(-7)-32 3).0.5+(-4/1）-（-2.75）+2/1 4）.33.1-（22..9）+（-10.5） 5）.（-8）-（-15）+（-9）-（-120） 6）.-3/2+（-6/1）-（-4/1）-2/1 7）.5/3-2/3+（—4/11）+4/13

1).=3/1-6/5=6/2-6/5=-2/1 2).=27-18-7-32=27-57=-303).=2/1-4/1+2.75+2/1=-4/1+2.75=2.54).=10.2-10.5=-0.35).=-8+15-9+120=-17+135=1186).=-3/4+4/1=4/57).=10/6-10/15-(4/11-4/13)=-10/9+2/1=-5/2

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