解:∵f(x)=1,x大于等于0, f(x)=-1,x小于0若x+2<0则有:x<-2 x+(x+2)*f(x+2)≤5→x+(x+2)*(-1)≤5→-2<5恒成立若x+2≥0 则有:x≥-2 x+(x+2)*f(x+2)≤5→x+(x+2)*1≤5→x≤3/2∴解集为x≤3/2