limit as (x,y) approaches (1,2) of 1+x+y

解答

(x, y) \to (1, 2) lim (1 + x + y)

4

求解步骤

(x, y) \to (1, 2) lim (1 + x + y)

代入值

(x, y) = (1, 2)

= 1 + 1 + 2

化简

= 4

f (x) = x^{3} - 5 + 2 x

x \to \infty lim (e^{- x})

\frac{\partial}{\partial x} (\frac{2 x - 3}{x y})

d er i v a t i v e 7 - 3 u

\frac{\partial}{\partial y} (x^{2} y + 3 y + x^{2} y^{3} - 4 x)