-(-5)=化简下列个数的符号-[+(-3.5)]= -{-[-(-1/2)]= -[-(a+b)]=

问题描述:

-(-5)=化简下列个数的符号
-[+(-3.5)]= -{-[-(-1/2)]= -[-(a+b)]=

-(-5)=5
-[+(-3.5)]=3.5 -{-[-(-1/2)]=1/2 -[-(a+b)]=a+b