Đáp án: 2√x -1= 3 giúp e với mọi người - Đáp án **Nếu đề là 2√( x) -1 = 3 ( ĐK x≥ 0) <=> 2√x = 3 +1 <=> 2√x = 4 <=> √x = 4/2 <=> √x = 2 <=> (√x )^2 = 2^2 <=> x = 4 ( TM) Vậy S=( 4) **Nếu đề là 2√( x -1) = 3 ĐKXĐ x - 1 ≥ 0 <=> x ≥ 1 <=> √(x -1) = 3/2 <=> (√(x -1))^2 = (3/2)^2 <=> x -1 = 9/4 <=> x = 9/4 +1 <=> x = 9/4 + 4/4 <=> x = 13/4(TM)...

Đáp án **Nếu đề là 2√( x) -1 = 3 ( ĐK x≥ 0) <=> 2√x = 3 +1 <=> 2√x = 4 <=> √x = 4/2 <=> √x = 2 <=> (√x )^2 = 2^2 <=> x = 4 ( TM) Vậy S=( 4) **Nếu đề là 2√( x -1) = 3 ĐKXĐ x - 1 ≥ 0 <=> x ≥ 1 <=> √(x -1) = 3/2 <=> (√(x -1))^2 = (3/2)^2 <=> x -1 = 9/4 <=> x = 9/4 +1 <=> x = 9/4 + 4/4 <=> x = 13/4(TM)...

tnhat2628

4 tháng trước

2√x -1= 3 giúp e với mọi người

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Huyydaychuai

4 tháng trước

Đáp án:

`**`Nếu đề là:

`2\sqrt{ x} -1 = 3 ( ĐK: x≥ 0)`

`<=> 2\sqrt{x} = 3 +1`$\\$

`<=> 2\sqrt{x} = 4`$\\$

`<=> \sqrt{x} = 4/2`$\\$

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

`<=> (\sqrt{x} )^2 = 2^2`$\\$

`<=> x = 4 ( TM)`

Vậy `S={ 4}`

$\\$

`**`Nếu đề là:

`2\sqrt{ x -1} = 3`$\\$ `ĐKXĐ: x - 1 ≥ 0 <=> x ≥ 1`$\\$ `<=> \sqrt{x -1} = 3/2`$\\$ `<=> (\sqrt{x -1})^2 = (3/2)^2`$\\$ `<=> x -1 = 9/4` $\\$ `<=> x = 9/4 +1`$\\$ `<=> x = 9/4 + 4/4`$\\$ `<=> x = 13/4(TM)`$\\$

Vậy `S={ 13/4}`

Huy Dương

4 tháng trước

`2sqrtx-1=3(x>=0)`

`<=>2sqrtx=4`

`<=>sqrtx=2`

`<=>x=4(TM)`

Vậy `x=4`

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2√x -1= 3 giúp e với mọi người

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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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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.