Cho mạch điện như hình vẽ, R1= R2= R. Các ampe kế có cùng điện trở R_A. Các vôn kế có cùng điện trở R_B . Biết A1 chỉ 0,1A, A2 chỉ 0,11 A. Các vôn kế cùng chỉ 9V. Tính R và HĐT giữa hai đầu đoạn mạch

Choose the best answer

1. I ...... at six this morning (wake/woke/have woken/am walking)

2. While her brother ... in the army, Thu...to him twice a month (is-writes/was-writes/was-wrote)

3. Mathematic and Literature are ... for children in this country.(religious/ option/ adding/ compulsory)

4. She is very sad because she is ... in this cold and strange place.(friendly/ friendliness/ friendless/ friendship)

5. We can tell you that we often have a friendly... in our class(atmosphere/ air/ matter/ impression)

6. I was very impressed ... the efficiency of the staff(on/to/in/by)

Viết PTHH và cân bằng

\(H_2SO_4+Ba\left(OH\right)_2\rightarrow...+...\)

Cân bằng các PTHH

1, H2SO4 (đặc) + FeO \(\rightarrow Fe2\left(SO4\right)3+SO_2\uparrow+H2O\)

2, H2SO4 (đặc) + Fe3O4 \(\rightarrow Fe_2\left(SO4\right)_3+H2O+SO2\uparrow\)

3, H2SO4 (đặc) + Fe(OH)2 \(\)\(\rightarrow Fe2\left(SO4\right)_3+H2O+SO2\)

4, \(H_2SO_{4_{ }}\left(\text{đ}\right)+FeCO_3\rightarrow Fe_2\left(SO_4\right)_3+H_2O+SO_2\uparrow+CO_2\uparrow\)

Rewrite

Be sure to get home at 9.00

-> Don't.......

Do you like to drink milk

-> You.......

I can't afford to buy the house

-> The house......

She couldn't go to school because it rained heavily

-> She couldn't........

Although she had a lot of difficult, she managed to sell the house

-> In spite of.........

Viết lại câu

You went to see the movie Dream City last night, didn't you?

-> Did.........

France presented the Statue of liberty to the United States in 1876

-> The Statue...................

Viết lại câu

This is the best computer i have ever used

-> I have never.......

He hasn't chatted with his classmates through the internet for ages

-> It's ages........

Trung's parents gave him a microcomputer on his birthday

-> Trung........

She couldn't go to school because it rained heavily

-> She couldn't.........

I can't afford to buy the house

-> THe house..........

That car is so expensive, i don't think t can buy it

-> It is such..............

He was delighte to receive his aunt's letter

-> He was delighted that his...........

I'm very sad that i wasn't accepted in that group

-> I'm very sad not...........

Rewrite

1. Be sure to get home at 9.00

-> Don't............

2. Do you like to drink milk?

-> YOu....................................

3. Mr Thanh couldn't enjoy the meal because of her sickness

-> The stomachache prevented...............

4.We couldn't go out because the weather was so bad

-> It was such.............

5. That restaurant is so dirty that noone wants to eat there

-> It is such...........

6. Despite his age, Mr Thanh runs five km every morning

-> Even............

7. There's no need for you to talk so loudly

-> you don't

8. She fell asleep because of the boring performance

-> the boring..............

9. She and I had never been there before

-> Neither she......................

10. How about something to eat before the show?

-> Shall...............?