Chi Mai Linh

5 tháng trước

Cho mình hỏi làm sao để $\frac{\sqrt[]{x}-1}{\sqrt[]{x}+1}$ = -1 ⇔ $\sqrt[]{x}-1$ = -$\sqrt[]{x}-1$ ạ?

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Phan Minh Châu

5 tháng trước

vì phương trình có căn ở dưới mẫu nên phải có điều kiện xác định, ở dấu tương đương thứ nhất ta nhân chéo

Avi Anh

5 tháng trước

Giải thích các bước giải:

Để `(\sqrt{x}-1)/(\sqrt{x}+1)=-1` $(x \geqslant 0)$

`<=>\sqrt{x}-1=-1.(\sqrt{x}+1)`

`<=>\sqrt{x}-1=-\sqrt{x}-1`

`<=>\sqrt{x}+\sqrt{x}=-1+1`

`<=>2\sqrt{x}=0`

`<=>\sqrt{x}=0`

`<=>x=0(tmđk)`

Vậy `x=0` thì `(\sqrt{x}-1)/(\sqrt{x}+1)=-1`

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Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

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We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

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I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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Cho mình hỏi làm sao để $\frac{\sqrt[]{x}-1}{\sqrt[]{x}+1}$ = -1 ⇔ $\sqrt[]{x}-1$ = -$\sqrt[]{x}-1$ ạ?

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Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

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Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

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