nguyenthanhminh0511

5 tháng trước

Tìm GTLN và GTNN của $\frac{ x^{2} -2x+2}{ x^{2} +2x+2 }$

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khangg2006

5 tháng trước

Đáp án:

`minA=-2\sqrt{2}+3` và `maxA=2\sqrt{2}+3`

Giải thích các bước giải:

Đặt `A=(x^2-2x+2)/(x^2+2x+2)`

`<=>Ax^2+2Ax+2A=x^2-2x+2`

`<=>Ax^2-x^2+2Ax+2x+2A-2=0`

`<=>(A-1)x^2+2(A+1)x+2A-2=0(A\ne1)`

`\Delta'=(A+1)^2-(A-1)(2A-2)>=0`

`<=>A^2+2A+1-2A^2+2A+2A-2>=0`

`<=> -A^2+6A-1>=0`

`<=> -(A^2-6A+1)>=0`

`<=>A^2-6A+1<=0`

`<=>A^2-2.A.3+3^2-8<=0`

`<=>(A-3)^2-8<=0`

`<=>(A-3)^2<=8`

`<=> -2\sqrt{2}<=A-3<=2\sqrt{2}`

`<=> -2\sqrt{2}+3<=A<=2\sqrt{2}+3`

Vậy `minA=-2\sqrt{2}+3` và `maxA=2\sqrt{2}+3`

Trái Tim Mùa Thu

5 tháng trước

Đáp án:3𝑥2+2

Giải thích các bước giải:Kết hợp các số hạng đồng dạng𝑥2−2𝑥+2𝑥2+2𝑥+2

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Tìm GTLN và GTNN của $\frac{ x^{2} -2x+2}{ x^{2} +2x+2 }$

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việt nam dành độc lập vào năm nào

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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Tìm GTLN và GTNN của $\frac{ x^{2} -2x+2}{ x^{2} +2x+2 }$

2 câu trả lời

Viết một đoạn văn hoàn chỉnh về lý do học tiếng Anh bằng cách đưa ra các manh mối ( ko chép mạng nhá)

việt nam dành độc lập vào năm nào

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.