Đặt \(A=\sqrt{\sqrt{2}-1}-\sqrt{\sqrt{2}+1}\left(A< 0\right)\)

\(\Rightarrow A^2=\sqrt{2}-1+\sqrt{2}+1-2\sqrt{\left(\sqrt{2}-1\right)\left(\sqrt{2}+1\right)}\)

\(\Leftrightarrow A^2=2\sqrt{2}-2\sqrt{2-1}=2\sqrt{2}-2\)

\(\Rightarrow A=-\sqrt{2\sqrt{2}-2}\)(vì \(A< 0\))

Vậy...

Mọi người làm lời giải chi tiết ra giúp em với ạ

 

\(A=-2\left(x^2-\dfrac{1}{2}x\right)=-2\left(x^2-2.x.\dfrac{1}{4}+\dfrac{1}{16}-\dfrac{1}{16}\right)\)

\(=-2\left(x^2-2x.\dfrac{1}{4}+\dfrac{1}{16}\right)+\dfrac{1}{8}=-2\left(x-\dfrac{1}{4}\right)^2+\dfrac{1}{8}\le\dfrac{1}{8}\)

\(\Rightarrow A_{max}=\dfrac{1}{8}\)

5. Tea is not as good as coffee.

6. Lan is not as tall as Lan.

7. The bus isn't as fast as the train.

8. Motorbikes aren't as convenient as cars.

9. Her suitcase is not as big as his one.

10. Your backpack is not as new as mine.

35. Although Ben wanted to study in France, his French was bad.

36. The fastest way to travel from Ho Chi Minh City to Ha Noi is flying.

37. Jane has a small old white house.

38. Your brother is not as young as mine.

39. They don't have to work at weekends.

40. He was late again, so I was really angry.

Hộp tên nha bạn 

Giúp e mấy bài đó đi mn ạ

 

go after somebody. đuổi theo, đi theo sau ai đó ...go along with somebody. đi cùng ai đó đến nơi nào đó ...go away. đi nơi khác, đi khỏi, rời (nơi nào). ...go back on one's word. không giữ lời. ...go beyond something. vượt quá, vượt ngoài (cái gì) ...go by. đi qua, trôi qua (thời gian) ...go down. giảm, hạ (giá cả) ...go down with. mắc bệnh.đây là một số cụm động từ đi với go

caused

imbalances 

diet

nutritionist 

healthy 

energy 

carbohydrates

result

important 

blood 

absorb

maintain 

1 am going to send

2 will get

3 will do

4 will be

5 are going to visit

6 will win

7 am going to take

8 are going

9 will go

10 is going to defeat

11 is going to have

12 will never lie

13 will fly

14 won't tell

15 will like