若点(1,3)为曲线 =a(x)^3+b(x)^2 的拐点,则a,b值应为 ()-|||-A =dfrac (9)(2), =-dfrac (3)(2)-|||-书 =-dfrac (3)(2) =dfrac (9)(2)-|||-C =-3, b=6-|||-D a=2 b=1

(B) =-dfrac (x)(2)+dfrac (3)(2)-|||-(C) =dfrac (x)(2)+dfrac (3)(2) (D) =-dfrac (

设曲线 =a(x)^3+b(x)^2 以点(1,3)为拐点,则数组 (a,b)= __ .

(B) dfrac (1)(2)(X)_(1)+dfrac (1)(2)(X)_(2)-|||-(C) dfrac (1)(2)(X)_(1)+dfrac (1

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)^

5.设点(1,3)是曲线 =a(x)^3+b(x)^2+1 的拐点,则a、b的值是 ()-|||-

lim _(xarrow 4)dfrac (sqrt {1+2x)-3}(x-4)= (-|||-A dfrac (2)(3) .-|||-B 2-|||-C

设L为椭圆dfrac ({x)^2}(2)+dfrac ({y)^2}(3)=1，其周长为a，则dfrac ({x)^2}(2)+dfrac ({y)^2}(3

已知 f(x)= (B) dfrac {3)(2) (C)2 (D) dfrac (1)(2)

求曲线^dfrac (2{3)}+(y)^dfrac (2{3)}=(a)^dfrac (2{3)},在点^dfrac (2{3)}+(y)^dfrac (2{

3.若抛物线 =a(x)^2 与曲线 =ln x 相切,则 a= () () .-|||-(A) dfrac (1)(2e) (B)2e (C) dfrac (