问题 解答题 化简下列各数.+(-123),-(+3.69),-(-520),-[-(+4.98)],+[-(+58.6)]. 答案 +(-123)=-123,-(+3.69)=-3.69,-(-520)=520,-[-(+4.98)]=4.98,+[-(+58.6)]=-58.6.