\(\orbr{\begin{cases}x-1=0\\x^3+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1\\x^3=-1\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=1\\x=-1\end{cases}...}\)

do x^2 + 1 > 0 với mọi x

Chúc bạn học tốt!

ta có (y-3)*3 = 495

 (y-3) = 495 / 3

y-3 = 165 

y = 165 + 3

y = 168 

Vậy y = 168 

Chúc bạn học tốt!

100-10=90

My teacher always drives very carefully .

=> How carefully of your teacher

1.The waiter by _____ we were served expected a large tip. A. who B. whom C. that D. whose

2.The hotel in _____ we stayed during our holidays was comfortable. A. it B. that C. which D. where

3. Have you ever met the girl ______ over there? A. sits B. sitting C. is sitting D. who she is sitting

4. The game ______ was difficult to understand. A. which played B. which we played it C. played by us D. we played 5. The letter ______ to the editor was very long. A. he wrote B. he wrote it C. which wrote D. which he wrote it

6. My friend _____ is a doctor has just had an operation. A. her husband B. whom C. whose husband D. whom her husband

7. The woman _____ I spoke told me to wait in the hall. A. who B. whom C. that D. to whom

8. Do you know the first person ______ the South Pole? A. reached B. reach C. to reach D. that reaching

9. She rang at midnight, _____ was a very annoying time. A. that B. which C. when D. what

10. A person _____ is a lecturer. A. who teaches at a university B. who at the university teaches C. teaches at the university who D. whom teaches at the university

1. Put the words or phrases in the correct order to make meaningful sentences :

a. use / we / cloth bags / instead / ought / reusing / to / of / plastic ones. ………………………………………………………………………………………

b.collected / and / used paper / it / for / Last year / we / recycling / sent ………………………………………………………………………………………

c. opening / you / mind / the / would / windows? ……………………………………………………………………………………….

d. you / Shall / waste basket / for / I / empty / the / ? ………………………………………………………………………………………

giúp m nha, m thực sự cần gấp, làm ơn

1. The Eagle team performed more successfully than the Lion team

=>The Lion Team didn't

2.In the countryside, the children play more freely than in the city

=> In the city, children

3. Ours ger are now better equipped than in the past

=> In the past, our gers weren't

4.A sport car goes faster thanm the ordinary car

=> An ordinary car goes

Giúp m nha m cần gấp lắm, làm ơn giúp vs

1. How many desks ___________ there? (be)

2. There ___________ one teacher in the room. (be)

3. ___________ he eleven ? (be) -No, he ___________ (not be)

4. Please ___________ in and ___________ down. (come / sit)

5. Students are in their ___________ at school. (room)

6. My family has 4 ___________. (person)

7. Ms. Mai says hello to the___________. (child) 8. They are in the ___________ room. (live)

9. What ___________ he ___________ ? (do)

10. What ___________ they ___________ ? (do)

11. How many ___________ are there ? (couch)

12. How many ___________ are there ? (stereo) 13. She is a ___________. (teach)

14. How ___________ are you ? (age)

15. It is an ___________ (chair)

16. There ___________ a board and 50 desks in my class. (be)

17. This ___________ my house. (be)

18. What ___________ those ? (be)

19. Are those your ___________? (class)

20. Where does Lan ___________ ? (live) - She ___________in Hai Phong City. (live)

113 đó nha!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!