解f'(x)=6x^2-6x 令f'(x)=0 解得x=0或x=1 当x属于（负无穷大,0）时,f'(x)＞0 当x属于（0,1）时,f'(x)＜0 当x属于（1,正无穷大）时,f'(x)＞0 故当x=0时,y有极大值f(0)=1.
