→ Mathmatics:考慮f(x,y)=(x^2 + y^2)^(1/2);a=b=0 06/15 10:01
2
Suppose that the function : R -> R is continuous. Let a and b be any real
number. Prove that
lim [f(x,y)-f(0,0)-ax-by] = 0
(x,y)->(0,0)
Is it true that
[f(x,y)-f(0,0)-ax-by]
lim ------------------------ = 0
(x,y)->(0,0) (x^2 + y^2)^(1/2)
第一題會我寫
但第二題就不知道了
請板上高手解釋一下吧
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