问题标题：
-2.5+(-1/5)0.4-(-1/4)+1/61/3-(-5/6)+2/31/3+(-1/5)+1+2/3========27-18+(-7)-320.5+(-1/4)-(-2.75)+1/2====
问题描述：
-2.5+(-1/5)0.4-(-1/4)+1/61/3-(-5/6)+2/31/3+(-1/5)+1+2/3
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27-18+(-7)-320.5+(-1/4)-(-2.75)+1/2
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冯春燕回答：
-2.5+(-1/5)0.4-(-1/4)+1/61/3-(-5/6)+2/31/3+(-1/5)+1+2/3
=-2.5-0.2=13/20+1/6=7/6+4/6=2/15+1+10/15
=-2.7=49/60=11/6=9/5
27-18+(-7)-320.5+(-1/4)-(-2.75)+1/2
=27-18-7-32=0.5-0.25+2.75+0.5
=-30=3.5
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