Use the correct tensen or form of the verbs in parentheses:

11. She suggest we...........by bike instead of by motorbike to save energy. (travel)

12. When it began to rain, the children .................in the yard. (play)

13. My father..............for the telephone company twenty years ago. (work)

14. We used .................in Dalat, but now we live in Ho Chi Minh City. (live)

15. The crowed shouted................when Zidane scored the first goal for the French team. (excite)

16. Huy Dat was............... in finding his lost bicycle, so he decided to buy a new one. (succeed)

17. His new car.....................a lot of fuel. (consumer)

18. Tsunami, earthquakes and typhoons are natural.......................(disastrous)

19. Their aim was to free women from domestic.....................(slave)

20. It would be more...................to turn off the air-conditioner before leaving (economy)

Use the correct form of the words in parentheses:

11. Minh Tuan met his old friend while he..................in Nha Trang (work)

12. Yesterday we ......................five minutes late. (arrive)

13. Flowes should ...............in warm places. (keep)

14. What makes you............... in the existence of UFOs? (believe)

15. Many new cars have much lower fuel.................... (consume)

16. We have a fierce..............in our traditions. (proud)

17. It was very ................of you leave matches where children could get them. (care)

18. He enjoys the constant..................... with students from other classes (interact)

19. The palace was.................. damaged by the fire. (extend)

20. Some .................groups have declared a boycott of tourism on the island (environment)

giải phương trình

a) \(\frac{x+1}{x-1}\)-\(\frac{x-1}{x+1}\)=\(\frac{4}{x^2-1}\)

b) \(\frac{8x^2}{3\left(1-4x^2\right)}\)=\(\frac{2x}{6x-3}\)-\(\frac{1+8x}{4+8x}\)

c) \(\frac{3}{4\left(x-5\right)}\)+\(\frac{15}{50-2x^2}\)= - \(\frac{7}{6\left(x+5\right)}\)

d) \(\frac{13}{\left(x-3\right)\left(2x+7\right)}\)+\(\frac{1}{2x+7}\)=\(\frac{6}{x^2-9}\)

giải phương trình:

j) 3x² +7x+2=0

k) x² -4x+1=0

l) 2x² - 6x +1=0

m) 3x² +4x - 4=0

n) x⁶ - x² =0

o) x³ -12 =13x

p) -x⁵ +4x⁴ = -12x³

q) x³ =4x

giải phương trình:

1. (x+2)(x-3)(17x² -17x+8)=(x+2)(x-3)(x²-17x+33)

2. \(\frac{1}{9}\)(x-3)² -\(\frac{1}{25}\)(x+5)² =0

3. (\(\frac{3x}{5}\)-\(\frac{1}{3}\))² =(\(\frac{x}{5}\)+\(\frac{2}{3}\))²

4. (\(\frac{2x}{3}\)+1)² =( \(\frac{3x}{2}\)-1)²

5. (x+1+\(\frac{1}{x}\))² = (x-1-\(\frac{1}{x}\))²

6. (x-\(\frac{3}{4}\))² + (x-\(\frac{3}{4}\))(x-\(\frac{1}{2}\))=0

Use the correct form of the words in parentheses:

15. Thanh Bach is a ...............................actor

16. The streets are filled with a..........................atmosphere when Tet comes (joy)

17. .................................schemes for refrigerators and washing machines help save energy (label)

18. Consumers like to use products which are both..................................and economical (effect)

19. ............................will be very pleased with the new products. (consume)

20. He rarely expresses his..........................to others. (feel)

Use the correct tense or form of the verbs in parentheses:

11. Anh Thu suggest the beach up on Sundays. (clean)

12. Sticky rice cakes by Vietnamese people on Tet. (enjoy)

13. If we refrigerator door , we'll save energy in the kitchen. (close)

14. We can inprove our speaking skill by speaking frequently English with foreigners (practice)

Cho ΔABC có đường cao AH. Trên AH, lấy các điểm K,I sao cho AK=KI=IH. Qua I, K lần lượt vẽ các đường thẳng EF//BC (E,M ∈ AB, F,N ∈ AC).

a, Tính \(\dfrac{MN}{BC}\) và \(\dfrac{EF}{BC}\)

b, Cho biết diện tích của tam giác ABC là 90cm². Tính diện tích tứ giác MNFE.

Cho ΔABC. Từ D trên cạnh AB, kẻ đường thẳng song song với BC cắt AC tại E. Trên tia đối của tia CA, lấy điểm F sao cho CF=DB. Gọi M là giao điểm của DF và BC. Chứng minh \(\dfrac{DM}{MF}\)=\(\dfrac{AC}{AB}\)

Gọi G là trong tâm của ΔABC. Từ G kẻ các đường thẳng song song với hai cạnh AB và AC, cắt BC lần lợt tại D và E. So sánh ba đoạn thẳng BD,DE,EC