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數學哦，你說的是


Prove that the following statements are equivalent: let S be a dense in R,
for a given sequence {xn},

(i) if for every 0 < ε∈ S, there exists N ∈ N such that
(ii) if for every 0 < ε∈ R, there exists N ∈ N such that
這種




還是，

Determine whether the given differential equation is exact, if it is exact,
solve it.

(x - y^3 + y^2．sinx ) dx = (3xy^2 + 2y．cosx) dy

這種




還是，

Let X1, . . . , Xn be a random sample of size n from a distribution that is
N(μ, σ^2), where σ^2 > 0. Show that the sum Zn = Σ Xi , i = 1:n , does not
have a limiting distribution.

這種？





啊，會不會是，

設ａ、ｂ為兩相異正整數，且500 < ａ < 600，若log3 ａ、log9 ｂ、log27 ａ成等差
數列，則ｂ=？

這種？







如果你喜歡的是第四種，那你喜歡的不是數學，是錯覺，謝謝



※ 引述《GuyFawkes (Guy Fawkes)》之銘言：
: 以前沒學好
: 誤入歧途
: 現在才後悔
: 怕已經來不及了QQ
: 大學畢業後忽然對數學有興趣該怎麼救?
: 想把數學當二專

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