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化简-(+4);-(-6);-(+3.9);-(3/4);-(-55);+(-4/3);-【-(8.2】;

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化简-(+4);-(-6);-(+3.9);-(3/4);-(-55);+(-4/3);-【-(8.2】;
-【-(-15)】;-{+【-(-6)}每道题的答案和格式
化简-(+4);-(-6);-(+3.9);-(3/4);-(-55);+(-4/3);-【-(8.2】;
-(+4)=-4;-(-6)=6;-(+3.9)=-3.9;
-(3/4)=-3/4;-(-55)=55;+(-4/3)=-4/3;
-【-(8.2】=8.2
-【-(-15)】=-15;
-{+【-(-6)}=-【-(-6)]=-6