函数f(x)=|x-2|(x+1),当x<=2时,f(x)=(2-x)(x+1),最大值f(0.5)=2.25.当x>2,f(x)=(x-2)(x+1),最小值f(2)=0,单调增.
可见,f(x)单增区间为:(-∞,0.5][2,+∞),单减区间为:(0.5,2)
若x∈[-1,3),在x<=2时,最大值f(0.5)=2.25.当x>2,f(3)=4,最大值为4
函数f(x)=|x-2|(x+1),当x<=2时,f(x)=(2-x)(x+1),最大值f(0.5)=2.25.当x>2,f(x)=(x-2)(x+1),最小值f(2)=0,单调增.
可见,f(x)单增区间为:(-∞,0.5][2,+∞),单减区间为:(0.5,2)
若x∈[-1,3),在x<=2时,最大值f(0.5)=2.25.当x>2,f(3)=4,最大值为4