(1)对函数求导得：f`(x)=3x^2+2ax-1 当x=1时,f(x)取得极值即f`(1)=0求的a=-1(2)f`(x)=3x^2-2x-1=3(x-1)(x+1/3)f(-1/3)=32/27 f(-1)=0 f(1)=0 f(2)=3综上所述：f(x)max=3,f(x)min=0望采纳,不懂可追问...