TL:
1/ Are the windows locked every day?
2/ Was him told about that?
3/ Has this present been opened?
4/ Are the trees being planted in the yard?
5/ How long hve these doors been painted?
6/ What is the party going to be bought for?
7/ Was a movie being seen at this time yesterday?
8/ How many books have been written up to now?
HT!

TL: (động từ cần chia là "play" phải không)
He played the guitar when he was in high school 
Lý do: QKĐ + when + QKĐ
HT!

B. (every day -> HTĐ)
HT

Does your mother go to work by bus? ’’Your mother’’ means ’’…’’.

A. her:  cô ấy (đúng 1 mình)

B. hers (đại từ sở hữu thay thế một cụm danh từ hay danh từ trước đó để tránh lặp lại trong câu.  )

C. she :cô ấy

D. she’s :của cô ấy

=> C. she :cô ấy, bà ấy
HT!

Ta có:  x:y = 7:11=> \(\dfrac{x}{11}=\dfrac{y}{7}\)
Áp dụng t/c của dãy tỉ số bằng nhau:
\(\dfrac{x}{11}=\dfrac{y}{7}\Rightarrow\dfrac{x+y}{11+7}=\dfrac{288}{18}=16 \) (vì x+y=288)
=> \(\dfrac{x}{11}=16\Rightarrow x=176 \)
=> \(\dfrac{y}{7}=16\Rightarrow y=112\)
Vậy ...
HT!

Ta có : Góc tới = góc phản xạ
     Hay       i     = i'
Mà i = 90^o - 30^o =60^o 
=> góc phản xạ (i') =60^o           

Huy:)
(＃°Д°)

TL:
\(A=\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+...+\dfrac{1}{1024}\)
\(\Rightarrow A\times2=\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+...+\dfrac{1}{1024}\right)\times2\)

\(\Rightarrow A\times2=1+\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+...+\dfrac{1}{512}\)

\(\Rightarrow A\times2-A=\left(1+\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+...+\dfrac{1}{512}\right)-\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+...+\dfrac{1}{1024}\right)\)

\(\Rightarrow A=1-\dfrac{1}{1024}=\dfrac{1023}{1024}\)

HT!

TL:

we remove litter in public areas such as streets and parks
#Sai thông cảm ah.
 

TL:
a,    (x-3)(2y-4)=0
  \(\Rightarrow\left[{}\begin{matrix}x-3=0\\2y-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\2y=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\y=2\end{matrix}\right.\)
Vậy x=2 ;x=3
HT!~!