Помогите пожалуйста,очень надо 9y (в кубе) -1=0

Помогите пожалуйста,очень надо 9y (в кубе) -1=0
- Предмет:
  Алгебра
- Автор:
  boomerwbro
- 6 лет назад

Ответы 1

$9y^3-1=0\\\\y^3=\frac{1}{9}\; \; \; \Rightarrow \; \; \; y=\frac{1}{\sqrt[3]9}=\frac{\sqrt[3]3}{3}\\\\ili\\\\a^3-b^3=(a-b)(a^2+ab+b^2)\\\\9y^3-1=(\sqrt[3]9y-1)(\underbrace{\sqrt[3]{9^2}\cdot y^2+\sqrt[3]9\cdot y+1}_{e 0;\; \ \textgreater \ 0,\; t.k.\; D\ \textless \ 0})=0\; \; \to \\\\\sqrt[3]9y-1=0\\\\y=\frac{1}{\sqrt[3]9}$
- Автор:
  bessiemorales
- 6 лет назад
- 0
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Task 2.
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2.
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4.

5.
6.
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Task 3.

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1.
2.
3.
4.
5.

6.
7.
8.
9.
10.

Task 5.
1.
2.
3.
4.
5.

6.
7.
8.
9.
10.

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1.
2.
3.
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Помогите пожалуйста,очень надо 9y (в кубе) -1=0

Ответы 1

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