Đáp án: Tìm giá trị của A=x^3+15x với x= ³ √5( √6+1) - ³ √5( √6-1) - Đáp án A=10 Giải thích các bước giải x=√[3](5(√(6)+1))-√[3](5(√(6)-1)) x^3=(√[3](5(√(6)+1))-√[3](5(√(6)-1)))^3 =√[3](5(√(6)+1))^3-√[3](5(√(6)-1))^3-3√[3](5(√(6)+1))√[3](5(√(6)-1)) (√[3](5(√(6)+1))-√[3](5(√(6)-1))) =5(√(6)+1)-5(√(6)-1)-3√[3](5(√(6)+1)5(√(6)-1)) x =10-3√[3](25(6-1)) x =10-3√[3](125) x...

Đáp án A=10 Giải thích các bước giải x=√[3](5(√(6)+1))-√[3](5(√(6)-1)) x^3=(√[3](5(√(6)+1))-√[3](5(√(6)-1)))^3 =√[3](5(√(6)+1))^3-√[3](5(√(6)-1))^3-3√[3](5(√(6)+1))√[3](5(√(6)-1)) (√[3](5(√(6)+1))-√[3](5(√(6)-1))) =5(√(6)+1)-5(√(6)-1)-3√[3](5(√(6)+1)5(√(6)-1)) x =10-3√[3](25(6-1)) x =10-3√[3](125) x...

jdjsssjskk

7 tháng trước

Tìm giá trị của `A=x^3+15x` với `x=` ³ √5( √6+1) - ³ √5( √6-1)

Xem đáp án

16 lượt xem

1 câu trả lời

hoang1o1o1

7 tháng trước

Đáp án:

$A=10.$

Giải thích các bước giải:

$x=\sqrt[3]{5(\sqrt{6}+1)}-\sqrt[3]{5(\sqrt{6}-1)}\\ x^3=\left(\sqrt[3]{5(\sqrt{6}+1)}-\sqrt[3]{5(\sqrt{6}-1)}\right)^3\\ =\sqrt[3]{5(\sqrt{6}+1)}^3-\sqrt[3]{5(\sqrt{6}-1)}^3-3\sqrt[3]{5(\sqrt{6}+1)}.\sqrt[3]{5(\sqrt{6}-1)} \left(\sqrt[3]{5(\sqrt{6}+1)}-\sqrt[3]{5(\sqrt{6}-1)}\right)\\ =5(\sqrt{6}+1)-5(\sqrt{6}-1)-3\sqrt[3]{5(\sqrt{6}+1).5(\sqrt{6}-1)} x\\ =10-3\sqrt[3]{25(6-1)} x\\ =10-3\sqrt[3]{125} x\\ =10-15x\\ \Rightarrow x^3=10-15x\\ \Leftrightarrow x^3+15x=10\\ \Leftrightarrow A=10.$

Đăng nhập để trả lời

Câu hỏi trong lớp Xem thêm

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

3 lượt xem

2 đáp án

21 giờ trước

31- Although I am poor, I always help the poor In spite of______________________ 32- In spite of the bad weather , the pilot will bring the plane down safely Although_ 33- although the team played well, they lost Despite____ 34- In spite of his good salary, he was unhappy in his job In spite of_ 35- in spite of his broken leg, he managed to get out of the car Although_ 26- Athough she is poor, she always helps the poor Much as_ 27- Although he was hard, she didn’t pass the exam Much as_ 28- Although he was rich, he didn’t help the poor No matter how 29- Although Peter is late, he could see the first film No matter_ 30. Although he isn’t rich. He isn’t happy. No matter_ 31. Although It was cold, he didn’t wear warm cloth No matter_ 32. Although his life was hard. He is determined to study well. Hard ______________________________ kết thúc ;-;

3 lượt xem

1 đáp án

21 giờ trước

21- in spite of his age, Mr Benson runs 8 miles before breakfast Although_______________________ 22- Although she said that she would cme, I don’t think she ever will Despite 23- Although we live in the same street, we don’t know each other Although 24- In spite of having little money, they are happy Although 25- In spite of the silly story, I enjoyed the film Although 26- Although Carol had a headache, she still read until late In spite of 27- Despite the bad weather, the trip was enjoyable Although_ 28- Despite being poor, she lives in happiness Even though 29- Despite not having the qualifications, Jane got the job Although_ 30- Although she was ill, she went to work Despite________________________

3 lượt xem

2 đáp án

21 giờ trước

việt nam dành độc lập vào năm nào

3 lượt xem

2 đáp án

21 giờ trước

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.

352

352 lượt xem

1 đáp án

1 năm trước

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

272

272 lượt xem

1 đáp án

1 năm trước

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

258

258 lượt xem

1 đáp án

1 năm trước

Tìm giá trị của `A=x^3+15x` với `x=` ³ √5( √6+1) - ³ √5( √6-1)

1 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.

Đề thi - đề kiểm tra Xem thêm

Chúng tôi

Học tốt

Liên kết

Mạng xã hội

Tìm giá trị của `A=x^3+15x` với `x=` ³ √5( √6+1) - ³ √5( √6-1)

1 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.

Đề thi - đề kiểm tra Xem thêm

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.