Biểu thức x - 3  có nghĩa khi:

A. x < 3

B. x < 0

c. x ≥ 0  

D.  x ≥ 3

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An nhân tiêu hồn chưởng

à bn ơi thiếu rồi phải có kq của nó. 

phép tính của nó là: 2x3+6x4=42(hình như là dzậy hôm thi mik đúng bài này)

tăng số 4 lên 2 đv bn nha, có j sai cho mik xin lỗi, đúng thì tick cho mik

\(\Rightarrow\) At present there are more than 8 billion people living on Earth

3/ He said to me, "Did your uncle plant the coffee trees in the field last year? "

=> He asked me if/whether my uncle planted ..... the previous year.

4/ " Mr and Mrs Pike have just read these newspapers", Nga said.

=> Nga said Mr and Mrs Pike had just.......

5/ " Does your sister take the vegetables to market everyday Minh?" Lan asked

=> Lan asked Minh if/whether his sister took ......

6/ She said, " I often listen to music at night"

=> She told she often listens .....

7/ " Have they written the answers in the exercise books?" the teacher said to me

=> The teacher asked me if/whether they had writeen.....

8/ Lan's mother said, " My daighter usually brushes her teeth before meals"

=> Lan's mother said her daughter usually .....

9/ Nga asked, " Did your father watch Joo Mong film last night, Nam ?

=> Nga aksed Nam if/whether his father watched .... the previous night.

10/ They said, " We have to do the assignments now. "

=> They told they had ..... then/immediately/at once.

11/ Lan says, "My sister seldom rides a bike to school".

=> Lan told her sister seldom rode ....

12/ " Students at secondary school and high school rarely sing English songs" She said.

=> She told students at ...... sang .....

13/ Ngan told Mai, " Don't feed the chickens."

=> Ngan told Mai not to feed.....

14/ They said , " Our teacher sometimes explains the difficult lesson. "

=> They told their teacher sometimes explained......

15/ My teacher of Geography says," The Earth moves around the sun"

=> My teacher ..... said The Earth moves/moved .....

16/ Nam said, " I am doing my homework now"

=> Nam said he was.... then.

17/ He said, " Can you meet me after class?"

=> He asked if/whether I could meet him....

18/ " Don't talk in class",Our teacher said.

=> Our teacher told us not to talk.....

19/ The policeman said, " Please show me your driving licence."

=> The policeman asked me to show him my .....

20/ "Don't touch this button or you'II get an electric shock",the man said to me

=> The man told not to .....

1. Nam said that his uncle often planted the vegetables in the afternoon
2. She said that her uncle would not plant the vegetables the afternoon after.