có ai đang onl kh d

Cho hình chóp tam giác đều S.ABC có cạnh đáy bằng a, góc giữa mặt bên và mặt đáy bằng 60°. Một hình cầu tiếp xúc với đáy ABC và tiếp xúc với tất cả các mặt bên của hình chóp (hình cầu nội tiếp hình chóp).
1.Tính bán kính R của hình cầu theo a.
2.Tính thể tích V của hình cầu đó.

Where she from

she from     nhat ban

hello các đồng k10🤡✨

chi tui cach hoc

ai thức meet tiếng anh không

He _______

A. will be here soon

B. will here be soon

C. will be soon here

D. be soon will ere

Has your teacher ever_______angry with you?

A. get

B. getting

C. got

D. gets

She is tired because she_______all day.

A. is studied

B. has been studying

C. had been studying

D. studied

study hard when you were at school?

A. Must you

B. Had you

C. Did you have to

D. Were you

I_______your uncle tomorrow, so I’ll give him your note.

A. have seen

B. shall have seen

C. see

D. am going to see

As the sun_______I decided to go out.

A. shines

B. has shone

C. shine

D. was shining

When the phone rang she_______a letter.

A. writes

B. will write

C. has written

D. was writing

There is no red wine? I_______white, then.

A. am going to have

B. have

C. will have

D. am having

My sweetheart_______smoking next week.

A. will give up

B. is going to give up

C. gives up

D. gave up

to the radio when you get up everyday?

A. Do you listen

B. Are you listening

C. Was you listening

D. Did you listen

I’m sorry. I don’t understand what_______.

A. you say

B. you’re saying

C. you will say

D. you would say

How long have you_______he was a liar.

A. been knowing

B. knew

C. know

D. known

He often_______so nervous before his exams.

A. feels

B. felt

C. was feeling

D. had felt

When she was 21 she_______across the United States.

A. drove

B. drive

C. driven

D. was driving

When I got to the office, I_______that I had forgot to lock the door.

A. realized

B. had realized

C. realize

D. have realized

After he_______his driving test he bought a car.

A. had passed

B. pass

C. passed

D. passing

I think John_______tomorrow.

A. would come

B. come

C. will come

D. comes

How _______since we_______school?

A. are you/ left

B. have you been/ have left

C. were you/ left

D. have you been/ left

“What a lovely boat!” “I_______half a year building this boat.”

A. spend

B. spent

C. spending

D. have spent

We are too late. The plane_______off ten minutes ago.

A. has taken

B. took

C. had taken

D. was taken

“How many pages_______so far?”

A. have you studied

B. did you study

C. do you study

D. had you studied

A video lab is______ useful means for language learning.

A. the

B. an

C. a

D. no article

It was______ best film I had ever read.

A. the

B. an

C. a

D. no article

My aunt has______ interesting novel.

A. the

B. an

C. a

D. no article

We live at______ third house from the church.

A. the

B. a

C. an

D. no article

______ used razor blade is______ useless thing.

A. The/ the

B. A/ a

C. An/ an

D. no article

We might be able to catch______ last train if we hurried.

A. a

B. an

C. the

D. no article

Paris is splendid by ______ night.

A. a

B. an

C. the

D. no article

Mark Twain, ______ American writer, wrote “Life on the Mississippi River”.

A. an

B. a

C. the

D. no article

He majors______ in English.

A. a

B. an

C. the

D. no article