Giúp nhanh với ạ cho mik dò 
K
Khách
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Những câu hỏi liên quan
DT
Đỗ Thanh Hải
CTVVIP
11 tháng 9 2021
Tham khảo
1. Someone will clean the room today. =>THE ROOM WILL BE CLEANED TODAY
2. Someone might steal the car. =>THE CAR MIGHT BE STOLEN
3. They had to cut down that tree.=>THAT TREE HAD TO BE CUT DOWN
4. They're going to demolish the old houses.=>THE OLD HOUSES ARE GOING TO BE DEMOLISHED
5. We can't restore the picture. =>THE PICTURE CAN'T BE RESTORED
6. You must make an appointment in advance.=>AN APPOINTMENT MUST BE MADE IN ADVANCE
7. I don't want people to make me a fool. =>I DON'T WANT TO BE MADE A FOOL
8. Someone has to look after the garden.=>THE GARDEN HAS TO BE LOOKED AFTER
9. He wants everybody to serve him. =>HE WANTS TO BE SERVED
10. They're going to interview him next week=>HE IS GOING TO BE INTERVIEWED NEXT WEEK
PN
1
PN
2
HP
29 tháng 7 2021
\(\left|cosx\right|=\dfrac{1}{2}\)
\(\Leftrightarrow\left[{}\begin{matrix}cosx=\dfrac{1}{2}\\cosx=-\dfrac{1}{2}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\pm\dfrac{\pi}{3}+k2\pi\\x=\pm\dfrac{\pi}{2}+k2\pi\end{matrix}\right.\)
\(\Leftrightarrow x=\pm\dfrac{\pi}{3}+k2\pi\)
NV
Nguyễn Việt Lâm
Giáo viên
29 tháng 7 2021
\(\left|cosx\right|=\dfrac{1}{2}\)
\(\Leftrightarrow cos^2x=\dfrac{1}{4}\)
\(\Leftrightarrow\dfrac{1+cos2x}{2}=\dfrac{1}{4}\)
\(\Leftrightarrow cos2x=-\dfrac{1}{2}\)
\(\Rightarrow2x=\pm\dfrac{2\pi}{3}+k2\pi\)
\(\Rightarrow x=\pm\dfrac{\pi}{3}+k\pi\)
BU
2
18 tháng 9 2023
Mình nhớ câu này mình đã giải rồi, không biết vì lý do gì mà bạn lại xóa đi vậy nhỉ? Và nếu CH đã đăng, yêu cầu bạn không đăng lại lần thứ 2!
Tham khảo
1. Someone will clean the room today. =>THE ROOM WILL BE CLEANED TODAY
2. Someone might steal the car. =>THE CAR MIGHT BE STOLEN
3. They had to cut down that tree.=>THAT TREE HAD TO BE CUT DOWN
4. They're going to demolish the old houses.=>THE OLD HOUSES ARE GOING TO BE DEMOLISHED
5. We can't restore the picture. =>THE PICTURE CAN'T BE RESTORED
6. You must make an appointment in advance.=>AN APPOINTMENT MUST BE MADE IN ADVANCE
7. I don't want people to make me a fool. =>I DON'T WANT TO BE MADE A FOOL
8. Someone has to look after the garden.=>THE GARDEN HAS TO BE LOOKED AFTER
9. He wants everybody to serve him. =>HE WANTS TO BE SERVED
10. They're going to interview him next week=>HE IS GOING TO BE INTERVIEWED NEXT WEEK