Cực Trị khó nek m.n ơi ? ai vào giải giúp đi ạk

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nguyenbahiep1

chonvuiqakhu said:
Cho hàm số y=(a^2-1)x^4-2(a^2-a-2)x^2+2a.Định m để hàm sô chỉ có một cực tiểu mà không có cực đại?
Bấm để xem đầy đủ nội dung ...

[laTEX]y' = 4(a^2-1)x^3 -4(a^2-a-2)x =0 \\ \\ x =0 \\ \\ (a-1)(a+1)x^2 - (a+1)(a-2) =0 \\ \\TH_1: a = -1 \Rightarrow y = -2 \Rightarrow ko-co-cuc-tri \Rightarrow (Loai) \\ \\ TH_2: a = 1 \Rightarrow y' = 0 \Rightarrow 2x =0 \Rightarrow T/M \\ \\ TH_3: a \not = \pm 1 \\ \\ dk: (a-1)(a+1) > 0 \Rightarrow a< -1 , a > 1 \\ \\ x = \frac{a-2}{a+1} \leq 0 \Rightarrow a \in (-1,2] \\ \\ dap-an: a \in [1,2][/laTEX]
 
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Many i phone lovers are generally excited while using advancements from the unit, numerous negative people out there suggest that the actual enhancements lack considering the duration http://www.mkehmonghealth.org/shop/iphone5.html of your energy since the final relieve as well as the growing competing mother nature from the cell phone market place.

Your fringe movement just like pursuing of The apple company will certainly once once more get the particular minds as well as brains of the masses and also consequently wholesale iPhone 5 provide apple in order to report splitting earnings.
 
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