c,rút gọn\(\dfrac{\sqrt{27a^3}}{\sqrt{3a}}\)+\(\sqrt{4a^2}\)

với x không âm

e/ tìm x, biết \(\sqrt{2x+1}=5\)

f/ tính giá trị biểu thức \(\dfrac{x\sqrt{x}-2\sqrt{2}}{x+\sqrt{2x}+2}\)

tại \(x=9-4\sqrt{2}\)

2. she has just bought a lot of new books for her course at school (change into passive voice 3. Last night/ I/listen/music/anh/do/my homework/when/Peter/come (Complete the sentence) 4. Nam said to Miss Hoa "do you have time to help me" (change into reported speech)

PART 1: Complete the second sentence so that it has a simliar meaning to the first sentence.

1. She said: I will hand in my assignment to the teacher tomorrow. -> She said______________________________________________________________

2. I want to become a robot designer, Tom said. -> Tom said ____________________________________________________________

3. My sister said: I am reading a science fiction book about life on Venus now. -> My sister said_________________________________________________________

4. The invention of the Internet in 1969 is the greatest invention, Ha said. -> Ha said that __________________________________________________________

5. His brother told him: You can use my computer today. -> His brother told him ____________________________________________________

6. Scientists said: In 50 years time we may be living on the moon. -> Scientists said ______________________________________________________

7. The children said, How do the scientists explore other planets? -> The children asked____________________________________________________

8. The interview asked me: Have you seen a UFO before? -> The interview asked me __________________________________________________

9. Im interested in sending letters to my friends. -> I like_______________________________________________________________

10. My brother is going to join the science club. -> My brother intends___________________________________________________

giải phương trình:

a, 4x+1=13-2x

b, (2x-5)(x-4)=0

c, \(\dfrac{x}{x+2}+\dfrac{6}{x-2}=\dfrac{2x+12}{x^2-4}\)

d, |x-3|=9-2x

Complete the second sentence so that it has a simliar meaning to the first sentence.

1.  She said: “I will hand in my assignment to the teacher tomorrow”. 

-> She said______________________________________________________________

2. “I want to become a robot designer,” Tom said.

 -> Tom said ____________________________________________________________

3. My sister said: “I am reading a science fiction book about life on Venus now”.

-> My sister said_________________________________________________________

4. “The invention of the Internet in 1969 is the greatest invention,” Ha said.
-> Ha said that __________________________________________________________

5. His brother told him: “You can use my computer today.”

-> His brother told him ____________________________________________________

6. Scientists said: “In 50 years’ time we may be living on the moon.” 

-> Scientists said ______________________________________________________

7. The children said, “How do the scientists explore other planets?”

-> The children asked____________________________________________________

8. The interview asked me:” Have you seen a UFO before?”

-> The interview asked me __________________________________________________

9. I’m interested in sending letters to my friends.

-> I like_______________________________________________________________

10. My brother is going to join the science club.

-> My brother intends___________________________________________________

Part 2: Make complete sentences using the cues.

1. This time next year/ Phuc/ learn/ new language/.

___________________________________________________________________

2. He / give / speech / to the students / Hanoi / 9 a.m tomorrow/.

___________________________________________________________________

3. She/ have/ holiday / Da Nang / the end of this month/.

___________________________________________________________________

4. They/ choose / take / bus/ school / yesterday/.

___________________________________________________________________

5. We/ need/ follow/ netiquette/ when / communicate / online/.

___________________________________________________________________

6. lot of / people / prefer/ work/ face-to-face/ than online/.

___________________________________________________________________

7. She / said / me/ that/ she/ visit/ Hoi An/ the following day/.

___________________________________________________________________

8. He/ told/ me/ that/ he/ read/ science fiction book/ then/.

___________________________________________________________________

9. Nick/ said / he /come/ small town / England/.

___________________________________________________________________

10. Tom/ asked/ his friend/ how/ people/ Venus/ communicate/.

___________________________________________________________________

Khử hoàn toàn 12 gam CuO nung nóng bằng khí hidro dư
a. Tính số gam đồng điều chế được
b. Tính thể tích khí H2 (đktc) cần dùng cho phản ứng trên

Tam giác ABC có AB = 5 cm, AC = 4 cm. Trên cạnh AB lấy điểm M sao cho AM = 3 cm, kẻ MN // BC (N thuộc AC). Tính độ dài đoạn thẳng AN.