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17 tháng 11 2021

Giúp em mấy câu này với ạ 

11. "It's raining now", he said.

à He said it was raining then.

12. "I saw Maria in the supermarket yesterday," said  Carlos.

à Carlos said he had seen Maria in the supermarket the previous day.

13. “You don’t keep your flat warm enough,” the doctor said to him

à The doctor told him not to keep your flat warm enough.

14. He said to me, “My car was stolen a few weeks ago,”

à He told me his car had been stolen a few weeks before.

15. She said, “I won’t buy this car because it is very old.”

à She said she wouldn't buy that car because it was very old.

c: \(\sqrt{3+\sqrt{8}}=\sqrt{2}+1\)

d: \(\sqrt{11+4\sqrt{6}}=2\sqrt{2}+3\)

e: \(\sqrt{14-6\sqrt{5}}=3-\sqrt{5}\)

4 tháng 9 2021

chị làm chi tiết cho em được ko ạ 

 

25 tháng 10 2021

12 A

13 C

14 C

15 C

16 B

14 A

18 C

19 A

20 D

a: \(\sqrt{2x+3}=5\)

\(\Leftrightarrow2x+3=25\)

hay x=11

b: \(\sqrt{\left(x-2\right)^2}=8\)

\(\Leftrightarrow\left|x-2\right|=8\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=8\\x-2=-8\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=10\\x=-6\end{matrix}\right.\)

2 tháng 10 2021

a) \(\sqrt{3+2x}=5\left(đk:x\ge-\dfrac{3}{2}\right)\)

\(\Leftrightarrow3+2x=25\Leftrightarrow x=11\left(tm\right)\)

b) \(\sqrt{\left(x-2\right)^2}=8\)

\(\Leftrightarrow\left|x-2\right|=8\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=8\\x-2=-8\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=10\\x=-6\end{matrix}\right.\)

c) \(đk:x\le3\)

\(\Leftrightarrow\sqrt{3-x}-3\sqrt{3-x}+5\sqrt{3-x}=6\)

\(\Leftrightarrow3\sqrt{3-x}=6\)

\(\Leftrightarrow\sqrt{3-x}=2\Leftrightarrow3-x=4\Leftrightarrow x=-1\left(tm\right)\)

d) \(đk:x\ge0\)

\(\Leftrightarrow4\sqrt{x}-6\sqrt{x}+4\sqrt{x}=5\)

\(\Leftrightarrow2\sqrt{x}=5\Leftrightarrow\sqrt{x}=\dfrac{5}{2}\Leftrightarrow x=\dfrac{25}{4}\left(tm\right)\)

e) \(đk:x\ge-5\)

\(\Leftrightarrow2\sqrt{x+5}-3\sqrt{x+5}+4\sqrt{x+5}=6\)

\(\Leftrightarrow3\sqrt{x+5}=6\Leftrightarrow\sqrt{x+5}=2\Leftrightarrow x+5=4\Leftrightarrow x=-1\left(tm\right)\)

f) \(đk:x\ge-2\)

\(\Leftrightarrow3\sqrt{x+2}-5\sqrt{x+2}+4\sqrt{x+2}=6\)

\(\Leftrightarrow2\sqrt{x+2}=6\Leftrightarrow\sqrt{x+2}=3\Leftrightarrow x+2=9\Leftrightarrow x=7\left(tm\right)\)

5 tháng 7 2021

3 D

4 B

5 C

6 C

7 B

8 A

9 A

10 C

11 B

12 C

5 tháng 7 2021

3. D

4. B

5. C

6. C

7. B

8. A

9. A

10. D

11. B

12. C

5 tháng 7 2021

13 A

14 C

15 B

16 C

17 A

18 B

19 D

20 C

7 tháng 1 2023

30 collection

-----------------------------------

31 Do you go on social media every day?

32 I don't watch much TV, exept a bit on Youtube

-----------------------------

33 .........forget to give me those stamps

34 ........... fluent E speaker

35 ........ singing an E song?

36 ........ Lan is a poor student, she studies very well