1、(1)单调增,x∈R(2)单调减,x∈R(3)x<-1/2时,单调减,x>-1/2时,单调增(4)x<-1/4时,单调增,x>-1/4时,单调减2、(1)x∈(-∞,0)单调减,x∈(0,+∞)单调增(2)D