Mọi ng ơi giúp mình với nhé!
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
28 tháng 11 2021
bạn giúp mình bài 7 trang 10 toán 7 ki 1 nhé
bạn có sdt ko cho mình xin với
HQ
Hà Quang Minh
Giáo viên
22 tháng 8 2023
Dấu \(\Rightarrow\) thứ nhất phải là -46x, bạn làm sai dấu rồi.
AD
5
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 5 2021
Question I
1 C
2 A
3 D
4 C
Question II
1 B
2 C
3 B
4 A
5 B
6 D
7 A
8 B
Question III
1 A
2 B
3 C
4 C
Question IV
1 plays
2 goes
3 goes
4 listens
5 watches
6 plays
7 goes
8 plays
QuestionV
1 He stayed at home because he was sick
2 It was very cold but they went swimming
3 We can go camping or we can go for a picnic
4 He didn't wash his hands so he had a stomachache
Question VI
1 They give away warm clothes to homeless people in Ha Noi.
2 We haven't had a vacation since last year
Queston VII
1 riding
2 went
3 have lived
4 take
26 tháng 5 2021
9C 10D 11C 12B 13A 14B 15B 16B 17A 18B 19D 20B 21B 22D 23C 24D 25C 26A
27. It is 300km from Ho Chi Minh city to Phu Quoc Island.
28. Traffic rules should be obeyed strictly by road users.
29. If you are not careful, you’ll hurt yourself.
30. They will be learning English this time tomorrow.
NV
Nguyễn Việt Lâm
Giáo viên
2 tháng 9 2021
Đặt \(cosx-sinx=t\Rightarrow-\sqrt{2}\le t\le\sqrt{2}\)
\(t^2=1-2sinx.cosx\Rightarrow sinx.cosx=\dfrac{1-t^2}{2}\)
Pt trở thành:
\(t\left(1+\dfrac{1-t^2}{2}\right)+1=0\)
\(\Leftrightarrow t^3-3t-2=0\)
\(\Leftrightarrow\left(t-2\right)\left(t+1\right)^2=0\Rightarrow\left[{}\begin{matrix}t=2\left(loại\right)\\t=-1\end{matrix}\right.\)
\(\Rightarrow cosx-sinx=-1\)
\(\Leftrightarrow\sqrt[]{2}cos\left(x+\dfrac{\pi}{4}\right)=-1\)
\(\Leftrightarrow cos\left(x+\dfrac{\pi}{4}\right)=-\dfrac{\sqrt{2}}{2}\)
\(\Leftrightarrow cos\left(x+\dfrac{\pi}{4}\right)=cos\left(\dfrac{3\pi}{4}\right)\)
\(\Leftrightarrow...\)
1 D
2 C
B
I
1 D
2 B
3 B
4 V
5 A
6 B
II
1 amazed
2 exciting
I
1 It is about 100km from HN to Thanh Hoa City
2 Despite being so young, Quang Hai footballer plays football
3 My father used to live in a small village when he was a child
4 I used to walk to school when I was a student
II
1 How long does it take you to go to school by bike?
2 Is it 120km from HCM City to Vung Tau?
I
1 talented
2 performance
3 decided
4 actress
1 Nick's favorite actors are Daniel Craig and Halle Berry.
2 He’s been in a lot of different kinds of films including action adventure, science fiction, and romantic drama
3 Because she’s beautiful
4 She plays the main character Storm
Cảm ơn nha!