Chuyển các câu sau sang bị động của HTTD.

1.                  She is cooking dinner now.

-> Dinner …………………………….………………. .

2.                  They are playing soccer in the yard now.

-> Soccer …is being played in the yard now…………………..…………….. .

3.                  My father is  watering the plants.

->  The plants …is being watered by my father…………………..……………………. .

4.                  I am learning English with my my teacher now.

-> English ……is being learnt with my teacher now ………………………………………………… .

5.          Lan is washing the dishes.

  -> The dishes ……is being washed by Lan…………………..…..……………. .

6.         We are having lunch.          

  -> Lunch is being had……………………………………..………. .

7.          He is painting the gate.       

-> The gate is being painted ………………………………….………… .

8.           My sister is cleaning the floor. 

-> The floor …is being cleaned by my sister…………………………………… .

9.         Ms Hoa is teaching the children. 

-> The children …is being taught by Ms Hoa…………………..…………… .

10.              Her brothers are flying kites.    

  -> Kites …are being flown by her brothers…………………………….………….. .

History: The study of the past

Music: Playing instruments and singing

Biology: The study of plant, animal and human life.

PE( Physical education): This subject helps pupils know how to develop their fitness

IT(Information Technology): How to use computers

Physics: The study of heat, sound, electricity, etc

Geography: The study of the's world physical features, climate, populations, etc.

\(y=sin^4x+cos^4x\)

Ta có: \(0\le sin^4x\le1\)

\(0\le cos^4x\le1\)

\(0\le sin^4x+cos^4x\le2\)

Vây GTNN là 0, GTLN là 2

y=3sinx+4cosx

\(-3\le3sinx\le3\\ -4\le4cosx\le4\\ -7\le3sinx+4cosx\le7\)

Vậy GTNN là -7, GTLN là 7

Cho 100ml dung dịch \(Al_2\left(SO_4\right)_3\)0,5M và HCl 1M vào 450ml dung dịch \(Ba\left(OH\right)_2\) 0,5(M) tạo ra m(g) kết tủa và dung dịch X. Tính m và \(C_M\) của các ion trong dung dịch X.

Mấy cao nhân giúp e với ạ huhiuu :(

Do tổng các hệ số thứ 1,2,3 là 46 nên ta có:\(C_n^0+C_n^1+C_n^2=46\)

\(\Leftrightarrow1+\dfrac{n!}{1!\left(n-1\right)!}+\dfrac{n!}{2!\left(n-2\right)!}=46\)

\(\Leftrightarrow1+n+\dfrac{\left(n-1\right)n}{2}=46\)

\(\Leftrightarrow n^2+n-90=0\)

\(\Leftrightarrow\left[{}\begin{matrix}n=9\\n=-10\left(loai\right)\end{matrix}\right.\)

Khai triển biểu thức: \(\left(x+\dfrac{1}{x}\right)^9\)

Hạng tử thứ k+1 trong biểu thức trên

\(\left(x+\dfrac{1}{x}\right)^9=C_9^{k+1}+\left(x^2\right)^{10-k}.\left(\dfrac{1}{x}\right)^{k+1}\)

đến đây mình chịu rùi hjhj b nào làm được giúp b kia với

9. It was so ______ having to sing in public.

embarrass

embarrassing

embarrassed

embarrassment

10. That lesson was much too difficult ______understand.

for I to

me to

for me to

that

11. Would you be _____to hold the door open?

too kind

so kind

as kind

kind enough

12. The carpet were so expensive that we didn''t buy them.

The carpet were such expensive for us to buy them.

The carpet were too expensive for us to buy them.

The carpet were too expensive for us to buy.

The carpet were very expensive for us to buy.

13. They were late. The plane _______off ten minutes earlier.

had taken

took

was taking

was taken

14. The film was so bored (A) that all (B) the audience had gone (C) home before (D) it ended.

 had gone=> went

so bored

all

had gone

before

15. When the dog died (A) , she was crying (B) very hard (C) for (D) half an hour.

died

was crying=> had cried

hard

for

1.how much does that leather handbag cost? hoặc how much is that leather handbag

2.there is a swimming pool in his house

ban tham khảo :3