f`(x)=6x^2-6(a-1)x
令f`(x)=0 x=0 x=a-1
讨论:
当a>1时,a-1>0,f(x)的增区间是(-∞,0),(a-1,+∞),减区间是(0,a-1)
极大值为:f(0)=1 极小值为:f(a-1)=1-(a-1)^3
当a
f`(x)=6x^2-6(a-1)x
令f`(x)=0 x=0 x=a-1
讨论:
当a>1时,a-1>0,f(x)的增区间是(-∞,0),(a-1,+∞),减区间是(0,a-1)
极大值为:f(0)=1 极小值为:f(a-1)=1-(a-1)^3
当a