3.确定下列函数的单调区间:-|||-(1) =2(x)^3-6(x)^2-18x-7 ;-|||-(2) =2x+dfrac (8)(x)(xgt 0) .

确定下列函数的单调区间:-|||-(1) =2(x)^3-6(x)^2-18x-7 ;-|||-(2) =2x+dfrac (8)(x)(xgt 0);-|||

3.确定下列函数的单调区间:-|||-(1) =2(x)^3-6(x)^2-18x-7 ;

确定下列函数的单调区间:-|||-=2x+dfrac (8)(x)(xgt 0).

1.求 =2(x)^3-6(x)^2-18x-7 的单调区间和极值

2.函数 f(x)=2x^3-6x^2-18x-7 的单调递减区间是()A. (-∞,-1)B. [-1,3]C. (3,+∞)D. -3,1

3.【单选题】求函数=2(x)^3-6(x)^2-18x+7-|||-__ __的极值。（）=2(x)^3-6(x)^2-18x+7-|||-__ __=2(x

已知函数 (x)=-dfrac (1)(2)(x)^2+3x-2ln x，则函数 (x)=-dfrac (1)(2)(x)^2+3x-2ln x的单调递

函数(x)=dfrac (1)(3)(x)^3+dfrac (1)(2)(x)^2的单调递增区间是( )A．(x)=dfrac (1)(3)(x)^

1.求下列函数的极值.-|||-(2) =2(x)^3-6(x)^2-18x+7 ;-|||-__

1.确定下列函数的凸性区间与拐点:-|||-(1) =2(x)^3-3(x)^2-36x+25 ;(2) =x+dfrac (1)(x);-|||-(3) =(