Đáp án: Giải bất phương trình 3/(√x + 2) < 1 - Đáp án + Giải thích các bước giải 3/(√x+2) <1 <=> 3/(√x+2) - 1<0 <=> 3/(√x+2) - (√x+2)/(√x+2) <0 <=> (3-√x-2)/(√x+2) <0 <=> (1-√x)/(√x+2) <0 Vì √x + 2>0 ∀x mà (1-√x)/(√x+2) <0 => 1-√x<0 <=> √x>1 <=> x>1 Vậy x>1 thì 3/(√x+2) <1

Đáp án + Giải thích các bước giải 3/(√x+2) <1 <=> 3/(√x+2) - 1<0 <=> 3/(√x+2) - (√x+2)/(√x+2) <0 <=> (3-√x-2)/(√x+2) <0 <=> (1-√x)/(√x+2) <0 Vì √x + 2>0 ∀x mà (1-√x)/(√x+2) <0 => 1-√x<0 <=> √x>1 <=> x>1 Vậy x>1 thì 3/(√x+2) <1

hoangviet2007

5 tháng trước

Giải bất phương trình: ` 3/{\sqrt{x} + 2} < 1 `

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Abaddon

5 tháng trước

Đáp án + Giải thích các bước giải:

`3/(\sqrt{x}+2) <1`

`<=> 3/(\sqrt{x}+2) - 1<0`

`<=> 3/(\sqrt{x}+2) - (\sqrt{x}+2)/(\sqrt{x}+2) <0`

`<=> (3-\sqrt{x}-2)/(\sqrt{x}+2) <0`

`<=> (1-\sqrt{x})/(\sqrt{x}+2) <0`

Vì `\sqrt{x} + 2>0 ∀x`

mà : `(1-\sqrt{x})/(\sqrt{x}+2) <0`

`=> 1-\sqrt{x}<0`

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

`<=> x>1`

Vậy `x>1` thì `3/(\sqrt{x}+2) <1`

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Giải bất phương trình: ` 3/{\sqrt{x} + 2} < 1 `

1 câu trả lời

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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.

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

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

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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.

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

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