【关于用导数求最大值和最小值如:求函数y=2x^3-3x^2-12x+5在[0,3]上的最大值,最小值求导之后得y'=6x^2-6x-12,当y'=0时,x1=2或x2=-1,但是题目说要在[0,3]上,我平时是将x=2,x=-1,x=0,x=3这4个点代入函数y=2x^3-3x^】
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