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$\text{Tính giá trị lớn nhất của A =}$ $\dfrac{2}{x+\sqrt{x}+1}$

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`A = 2/(x + sqrtx + 1)`

`<=> A = 2/(x + sqrtx + 1/4 + 3/4)`

`<=> A = 2/[(sqrtx + 1/2)^2 + 3/4]`

`-` Ta có `(sqrtx + 1/2)^2 + 3/4 >= 3/4`.

`-` Để A đạt GTLN thì `2/[(sqrtx + 1/2)^2 + 3/4]` phải đạt GTLN.

`<=> 2/[(sqrtx + 1/2)^2 + 3/4] <= 8/3`

`<=> A <= 8/3`

`-` Dấu "=" xảy ra khi `sqrtx + 1/2 = 0 <=> sqrtx = -1/2 ( KTM )`.

Vậy không có x để `A_(max) = 8/3`

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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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$\text{Tính giá trị lớn nhất của A =}$ $\dfrac{2}{x+\sqrt{x}+1}$

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.

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