Combine 2 sentences using Relative Pronouns:

1. There are a lot of interesting places. I'd like to visit them.

=> There are a lot of interesting places where I'd like to visit

2. I'm looking forward to the programme. It's on after the news.

=> I'm looking forward to the programme which is on after the news

3. Do you remember the hotel in Edinburgh? Your parents stayed there last year.

=> Do you remember the hotel in Edinburgh where Your parents stayed last year?

4. Those are shose. I cleaned them for you.

=> Those are shose which i cleaned for you

5. That's the old lady. Her brother won the Nobel Prize.

=> That's the old lady whose brother won the Nobel prize

6. I've lost the list. I had it in my hand a moment ago.

=> I've lost the list which i had in my hand a moment ago

7. Andrea went to see the dentist. He took out two of hos teeth.

=> Andrea went to see the dentist who took out two of hos teeth

8. Have you seen the film? It's on at the Odeon.

=> Have you seen the film which is on at the odeon?

9. Edward has just moved to France. His mother died last year.

=> Edward whose mother dided last year, has just moved to France 

10. Lydia is reading that fascinating book on Spanish history. You lent it to her last week.

=> Lydia is reading that fascinating book on Spanish history which you lent to her last week

11. He cheated on me. That makes me cry so much.

=> He cheated on me why makes me cry so much

12. Mary has got the highest score in my class. That makes me surprise.

=> Mary has got the highest score in my class why makes me surprise

13. Trung's grandfather passed away. That makes him sad.

=> Trung's grandfather passed away why makes him sad

14. My test score was terrible. That makes me really disappointed.

=> My test score was terrible why makes me really disappointed

15. Tram always stay beside me when i have troubles. That makes me touched.

=> Tram always stay beside me when i have troubles why makes me touched

16. My mother baked me a cake for my birthday party. That makes me happy.

=> My mother baked me a cake for my birthday party why makes me happy

17. My brother forgot my shoes size. That makes me so frustrated.

=> My brother forgot my shoes size why makes me so frustrated

18. He did everything he could to help me. That touches me.

=> He did everything he could to help me why touches me

19. She is crying a lot. That makes me confused.

=> She is crying a lot why makes me confused

20. Tom invited me to have dinner with him in a restaurant. That makes me happy

=> Tom invited me to have dinner with him in a restaurant why makes me happy

Câu 2:

\(R1=R_{nt}-R2=9-6=3\Omega\)

\(=>R_{ss}=\dfrac{R1\cdot R2}{R1+R2}=\dfrac{3\cdot6}{3+6}=2\Omega\)

Chọn A

3.15:
EF vuông góc MH

NP vuông góc MH

Do đó: EF//NP

3.17:

góc yKH+góc H=180 độ

mà hai góc này là hai góc ở vị trí trong cùng phía

nên Ky//Hx

nSO3=8/80=0,1(mol)

pthh: SO3 + H2O -> H2SO4

nH2SO4=nSO3=0,1(mol) => mH2SO4(tạo sau)= 0,1.98=9,8(g)

mH2SO4(tổng)= 100.9,8% + 9,8=19,6(g)

mddH2SO4(sau)=8+100=108(g)

=>C%ddH2SO4(sau)= (19,6/108).100=18,148%

Do vai trò của 3 biến là như nhau, không mất tính tổng quát giả sử \(x>y>z\)

Ta có: \(x-z=\left(x-y\right)+\left(y-z\right)\)

Đặt \(\left\{{}\begin{matrix}x-y=a>0\\y-z=b>0\end{matrix}\right.\)  

Do \(x;z\in\left[0;2\right]\Rightarrow x-z\le2\) hay \(a+b\le2\)

Ta có:

\(P=\dfrac{1}{a^2}+\dfrac{1}{b^2}+\dfrac{1}{\left(a+b\right)^2}\ge\dfrac{1}{2}\left(\dfrac{1}{a}+\dfrac{1}{b}\right)^2+\dfrac{1}{\left(a+b\right)^2}\ge\dfrac{1}{2}\left(\dfrac{4}{a+b}\right)^2+\dfrac{1}{\left(a+b\right)^2}\)

\(P\ge\dfrac{9}{\left(a+b\right)^2}\ge\dfrac{9}{2^2}=\dfrac{9}{4}\)

Dấu "=" xảy ra khi \(\left\{{}\begin{matrix}a=b\\a+b=2\\\end{matrix}\right.\) \(\Rightarrow a=b=1\) hay \(\left(x;y;z\right)=\left(0;1;2\right)\) và các hoán vị

3.14:

Ta thấy $\widehat{xNM}=\widehat{xQP}=45^0$. Mà 2 góc này ở vị trí đồng vị nên $MN\parallel PQ$

3.15

$EF\parallel NP$ do cùng vuông góc với $MH$

3.16: Bạn tự vẽ hình nhé.

3.17:

Ta thấy $\widehat{yKH}+\widehat{KHx}=130^0+50^0=180^0$. Mà 2 góc này ở vị trí trong cùng phía nên $Ky\parallel Hx$

tk: