\(\left\{{}\begin{matrix}\dfrac{2}{x-3}=\dfrac{2\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}=\dfrac{2x+6}{x^2-9}\\\dfrac{7}{x^2-9}\end{matrix}\right.\)

1. I/ a pair of shoes/ gave him/ on his birthday/

………I gave him a pair of shoes on his birthday.……………

2. she/ next month/ going to sing/ her first big concert/ in/.

………She is going to sing in her first big concert next month…………..

4. we/ going/ the country/ to/ at the weekend/ like/.

……We like going to the country at the weekend.……….

5. I/ go out/ rarely/ because/ too expensive/ every thing/ is/

……I rarely go out because every thing is too expensive.…………

6. you/ stop/ should/ playing vedeo games/

…………You should stop playing video games……………..

7. she/ to learn English/ began/ six month ago/

………She began to learn English six months ago………..

8. it/ becoming/ is/ darker and darker/

……It is becoming darker and darker…………..

9. many Vietnamese farmers/ living/ are/ in poverty/

……Many Vietnamese farmers are living in poverty…………

10.Sally/ listening to music/ is/ in her room/

……Sally is listening to music in her room…………

11.Our/ last/ team/ played/ Saturday/ 6 E team/ with.

….……..................................................……….

12.Don’t /food and drink/ into/ bring/ please/ ,/ the gym.

….…Don't bring food and drink into the gym, please……………….

13.every/ The Olympic Games/ four years/ takeplace.

….…The Olympic Games takes place every four years…………….

14.see/ you/ Did/ Phong/ yesterday/ the stadium/ at ?

….……Did you see Phong at the stadium yesterday?………….

15.a week/ three times/ my/ sister/ aerobics/ does/ keep fit/ to.

….……My sister does aerobics three times a week to keep fit.……….

II.   Complete the sentences using the past simple passive form of the verbs in brackets.

1.   The Temple of Literature ___was constructed______________ (construct) in 1070 under Ly ThanhTong’s dynasty.

2.   The statues ______were built___________ (build) by the Ha Noi People’s Committee in 2003.

3.   The Doctors’ stone tablets ____were recognised_____________ (recognise) by UNESCO in 2010.

4.   The construction of TuDuc Tomb ____was completed_____________ (complete) in 1876.

5.   The students of the Imperial Academy ____were selected_____________ (select) from regional examinations.

6.   Originally, the Po Nagar tower ____was made_____________ (make) of wood in order to worship Goddess Po Nagar.

7.   Between 1442 and 1779, eighty-one exams __were held_______________ (hold) by the Le dynasty.

8.         Chu Van An ____was born_____________ (bear) in Van Thon village, Thanh Dam district.

1.  that / £200 / was / was/ it / reported / donated / build / to / park / local / the.

It was reported that $200 was donated to build the local park.

2.  it / yesterday / that / Jim / would / meeting / to / come / the / Was / expected?

Was it expected that Jim would come to the meeting yesterday?

4.  is / that / is / a / view / hotel / from / of / spectacular / the / It / claimed / there / mountain / that.

It is claimed that there is a spectacular view of the mountain from that hotel.

5.  in / It / Vietnam / is / that / should / believed / rickshaw / by / travelling / try / tourists.

It is believed that tourists should travelling by rickshaw in Vietnam.

6.  that / that / there / many / cottages / It / many / was / rumored / picturesque / village / in.

It was rumored that there were many picturesque cottages in that village.

7.  breathtaking / of / claimed / was / lake / that / could / be / scene / here / It / a / the / seen / from.

It is claimed that a breathtaking scene of the lake could be seen from here.

8.  these / for / road / rumored / that / Is / trees / it / be / cut / down / construction / will.

Is it rumored that these trees will be cut down for road construction? 

Tham khảo:

Câu 2:

* So sánh đồng hóa và dị hóa:

- Giống nhau: Đều xảy ra trong tế bào

- Khác nhau:

Gọi số HS lớp 7A,7B lần lượt là a,b(HS)(a,b∈N*)

Áp dụng t/c dtsbn:

\(\dfrac{a}{5}=\dfrac{b}{6}=\dfrac{2a}{10}=\dfrac{3b}{18}=\dfrac{3b-2a}{18-10}=\dfrac{24}{8}=3\)

\(\Rightarrow\left\{{}\begin{matrix}a=3.5=15\\b=3.6=18\end{matrix}\right.\)(nhận)

Vậy....

a) Ta có: \(AB=DC,AB//CD\)(ABCD là hình bình hành)

Mà \(K,E\in AB,CD;AK=\dfrac{1}{2}AB;CE=\dfrac{1}{2}CD\)

\(\Rightarrow AK=CE\) và \(AK//CE\)

=> AECK là hình bình hành

b) Ta có: O là giao điểm 2 đường chéo AC và BD

=> O là trung điểm AC

=> O là trung điểm KE(AECK là hình bình hành)

=> E,O,K thẳng hàng

a) \(P=U.I\Rightarrow I=\dfrac{P}{U}=\dfrac{75}{220}=\dfrac{15}{44}\left(A\right)\)

b) \(A=P.t=75.30.4.60.60=32400000\left(J\right)=9\left(kWh\right)\)

c) Tiền điện phải trả: \(9.2000=18000\left(đồng\right)\)

\(R_{12}=R_1+R_2=10+10=20\left(\Omega\right)\)

\(R_{tđ}=\dfrac{R_{12}.R_3}{R_{12}+R_3}=\dfrac{20.30}{20+30}=12\left(\Omega\right)\)

\(A=\dfrac{U_{AB}}{R_{tđ}}=\dfrac{24}{12}=2\left(A\right)\)

\(U=U_{12}=U_3=24V\)

\(I_{12}=I_1=I_2=\dfrac{U_{12}}{R_{12}}=\dfrac{24}{20}=1,2\left(A\right)\)

\(\left\{{}\begin{matrix}U_1=I_1.R_1=1,2.10=12\left(V\right)\\U_2=I_2.R_2=1,2.10=12\left(V\right)\end{matrix}\right.\)