20、曲线y=x^3-x^2+3x+2的上凸区间为B、(-infty,(1)/(3)) C、(-infty,3) D、((1)/(3),+infty) E、(-3,+infty)

1、曲线 =3(x)^4-4(x)^3+1 的凸区间是 () ;-|||-(A) (-infty ,0) (B) (1,+infty ) (C) (dfrac

(int )_(-infty )^+infty (x)^2(e)^-a(x^2)dx=dfrac (1)(2)sqrt (dfrac {pi )({a)^3}}

[题目]下列函数在指定区间 (-infty ,+infty ) 上单调-|||-增加的是 ()-|||-A;sinx-|||-B;e^x-|||-C;x^2-|

(4) (x)=(x)^3-(x)^2-x+1 满足 () .-|||-(A)在 (-infty ,-dfrac (1)(3)] 内单调递增 (B)在 [ d

[题目]函数 (x)=lg (x-1)+sqrt ({x)^2-3x+2} 的定义域-|||-为 ()-|||-A、 (2,+infty )-|||-B、 [

判断:设函数 =12(x)^3-12(x)^2 的单调增区间为-|||-(-infty ,0)cup (dfrac (2)(3),+infty )..

计算lim _(xarrow infty )((dfrac {2-x)(3-x))}^x-|||-__计算

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;

(3) lim _(xarrow infty )((dfrac {2x+3)(2x+1))}^x+1;