a

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aaa答:a4a4a+1所以:-|4a+1|=4a+1a|4a+1|=-(4a+1)-|4a+1|=-[-(4a+1)]=4a+1

a
a<-3分之1 则-|4a+1|=

a
答:
a<-1/3
4a<-4/3
4a+1<-1/3<0
所以:
-|4a+1|=4a+1

a<-1/3 4a<-4/3 4a+1<-4/3 +1=-1/3<0
|4a+1|=-(4a+1)
-|4a+1|=-[-(4a+1)]=4a+1

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