Course Content
高二数学 | 高级数学
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13.1 Derivatives 导数


 

[1]

Differentiate the following functions by the first principle.

用第一法则微分下列各函数

(a) y = x^2

(b) y = 4x

(c) y = \sqrt{x+1}

(d) f (x) = \frac{1-x}{2+x}

Answer 答案:
(a) 2x

(b) 4

(c) \frac{1}{2\sqrt{x+1}}

(d) -\frac{3}{(2+x)^2}

[2]

Determine the derivative of the following functions at x_0 = 1 by the first principle.

用第一法则计算在x_0 = 1时下列各函数的导数。

(a) y = 3x^2 - 2

(b) y = \frac{1}{2 - x}

(c) f(x) = \sqrt{x^2 + 1}

Answer 答案:
(a) 6

(b) 1

(c) \frac{1}{\sqrt{2}}

[3]

Given that f(x)= \frac{(x-3)(x-5)(x-7)(x-9)}{(x-2)(x-4)(x-6)} , find the value of f ’(5) by first principle.

已知 f(x)= \frac{(x-3)(x-5)(x-7)(x-9)}{(x-2)(x-4)(x-6)} , 用第一法则求 f ’(5) 的值。

Answer 答案:
-\frac{16}{3}