Giúp em đi ạ. Em cần gấp lắm
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Những câu hỏi liên quan
3 tháng 10 2021
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...
NV
Nguyễn Việt Lâm
Giáo viên
11 tháng 11 2021
\(A=-2\left(x^2-\dfrac{1}{2}x\right)=-2\left(x^2-2.x.\dfrac{1}{4}+\dfrac{1}{16}-\dfrac{1}{16}\right)\)
\(=-2\left(x^2-2x.\dfrac{1}{4}+\dfrac{1}{16}\right)+\dfrac{1}{8}=-2\left(x-\dfrac{1}{4}\right)^2+\dfrac{1}{8}\le\dfrac{1}{8}\)
\(\Rightarrow A_{max}=\dfrac{1}{8}\)
LT
24 tháng 3 2023
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.
NH
1
F
1
21 tháng 4 2020
- 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
TL
1
DT
Đỗ Thanh Hải
CTVVIP
10 tháng 8 2021
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
\(=\dfrac{\sqrt{6}\left(\sqrt{2}-\sqrt{3}\right)}{\sqrt{2}-\sqrt{3}}-2-2\sqrt{6}+\sqrt{6}-1\)
\(=\sqrt{6}-\sqrt{6}-3\)
=-3