cho hàm số $y=\sqrt{x}$, $\Delta$ là số gia của dối số tại x.K

Question

Cơ bản

cho hàm số $y=\sqrt{x}$, $\Delta$ là số gia của dối số tại x.Khi đó $\frac{\Delta y}{\Delta x}$ bằng:

4 câu trả lời

Answer 1

$\frac{1}{\sqrt{x+\Delta x}+\sqrt{\Delta x}}$

Answer 2

$\frac{\sqrt{x+\Delta x}-\sqrt{\Delta x}}{\Delta x}$

Answer 3

$\frac{\sqrt{\Delta x-x}}{\Delta x}$

Answer 4

$\frac{\sqrt{\Delta x}-x}{\Delta x}$