[考古] 請教二題微積分
可以解說一下嗎？謝謝
勞煩了
◎
2 2 4 xy
2x + 3y( x + e )
Let f(x,y) =------------------- if x≠y ; f(x,y) =0
x-y
if x= y . Find the value of the partial derivative
f f( 0, 0 )
x
(a)1 (b) 2 (c) 3 (d) does not exist.
◎
2
x-y 2
Find the range of the function f(x,y) = e + x + 3
( a) (0 ,∞) (b) (-∞,∞ ) (c) [3 , ∞) (d) (3,∞)
謝謝
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