• 求最大值及最小值和极值

    求导大于03x^2-3x>0即x(3x-3)>0所以x>1或者x<0选C求导原式=-3x^2+3=-3(x^2-1)>0即(-1,1)增区间(-无穷,-1)(1,+无穷)减区间所以f(-1)极小=1-3+2=0f(1)极大=-1+3+2=4选Cf(x)=x-x^3求导=1-3x^2>0得出(-根号3/3,根号3/3)增区间(-无穷,-根号3/3)(根号3/3,+...

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