曲线 =dfrac (1)(x) 在点 (dfrac (1)(2),2) 处的切线的斜率为 ()-|||-A dfrac (1)(4)-|||-B -4-|||-C -dfrac (1)(4)-|||-D 4

f(x)= ({e)^4-dfrac (1)(3))-|||-dfrac (1)(2)(e)^4-|||-dfrac (1)(2)((e)^2-dfrac

设 L 是抛物线=dfrac (1)(4)(x)^2上 点=dfrac (1)(4)(x)^2与 点=dfrac (1)(4)(x)^2 的一段弧则=dfrac

2.曲线 =(x)^2+dfrac (3)(x) 在点(1,4)处的切线方程为 __

dfrac (1)(2)x+dfrac (1)(3)=dfrac (1)(4)x-dfrac (1)(5)

(3)曲线 =sqrt (4ax-{x)^2} 在点 (a,sqrt (3)a) 处的曲率为 ()-|||-(A) dfrac (1)(a) (B)a (C)

下列选项中曲面dfrac ({x)^2}(4)+dfrac ({y)^2}(1)+dfrac ({z)^2}(9)=3上点dfrac ({x)^2}(4)+df

11.曲线=dfrac (x)(2)+dfrac (4)(x)在点(2,3)处的切线方程为_________.11.曲线在点(2,3)处的切线方程为______

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

函数(x)=dfrac (1)(4x-1)当（ ）时，为无穷大量。A (x)=dfrac (1)(4x-1) B (x)=dfrac (1)(4x-1)

2.求曲线 =dfrac (1)(x) 在点 (2,dfrac (1)(2)) 处的切线方程和法-|||-线方程。