Một sân vận động được vẽ trên giấy gồm một hình chữ nhật và hai nửa hình tròn với kích thước như hình vẽ với tỉ lệ là 1 chia 1500 tính chu vi của sân vận động ngoài thực tế.

$\frac{1}{x+2}$+$\frac{1}{(x+2)(4x+7)}$= $\frac{2x²-x}{x-1}$+$\frac{x+1}{1-x}$+ $\frac{2-x²}{x-1}$= $\frac{3x+5}{x²-5x}$+ $\frac{25-x}{25-5x}$= $\frac{5}{2x²y}$+$\frac{3}{5xy²}$+$\frac{x}{y³}$=

BÀI 1 1+ 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 =? BÀI 2: 54321 - 12345 = ?

I. Choose the best answer to complete each of the following sentences. 1. In 1990, due to the change of the economic situation, Dong Ho paintings were difficult to sell and many… quit their job. A. craftsmen B. crafts C. craftsmanship D. craft unions 2. The Van Phuc silk producers have expended their silk garment goods ……they can satisfy the varied demand for their silk. A. so that B. in order to C. despite D. because 3. It turned out that we rushed to the airport as the plane was delayed by several hours. A. hadn’t B. should have C. needn’t have D. mustn’t 4. Weaving mats in Dinh Yen, Dong Thap used to be sold in the “ghost” markets set up at night and operate up to early morning the government built a new market five years ago. A. after B. as soon as C. when D. until 5. Since changing the way of production, many craftsmen have voluntarily joined together to for . A. cooperatives B. cooperative C. cooperates D. cooperation 6. I don’t like to ask people for help but I wonder if you could me a favour. A. make B. do C. find D. pick 7. Nowadays, Tan Chau artisans can produce silk of multiple colours they can meet customers’ demands. A. but B. in order C. so D. so that 8. Situated on the bank of the Duong river, the village was famous for the of making Dong Ho paintings. A. manufacture B. activity C. craft D. production 9. There was no in continuing for him the race was over. A. value B. worth C. point D. profit 10. a large number of the country’s crafts villages are suffering from a shortage of human resources and difficulties in building brand recognition, many international organizations have had projects to help them. A. Even B. Although C. However D. But 11. Vietnamese traditional is done with a simple hammer and chisel. A. sculptured feature B. Sculptor C. sculpture pieces D. sculpture 12. This cloth very thin. A. feels B. touches C. holds D. handles 13. It was only he told me his surname that I realized that we had been to the same school. A. until B. when C. since D. then 14. a majority of Vietnamese small and medium enterprises do not have in-house designers or specialized design staff, they have to hire freelance designers. A. While B. Since C. Due to D. Despite the fact

phenolphtalein có làm đổi màu của bazo Zn(OH)2 hay ko ạ??

nhanh lên mọi người ơi !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

Part 2. Supply the correct form of the word provided in each blank. Many (1. RESEARCH) ________believe that apes can communicate with human beings. Investigations made at several laboratories in the United States and elsewhere indicate that chimpanzees and gorillas are capable of understanding language and line using (2. LANGUAGE) ________responses at the level of a four – year – old child. Washoe, an adult chimpanzee who was raised as if she were a deaf child, can translate words she hears into American Sign Language. Loko, a 400-pound lowland gorilla, is claimed to have understood a poem (3. WRITE) ________about her. Tests of Koko’s auditory comprehension show that she is able to make discriminations between such words as “funny”, “money”, and “bunny”. The (4. SCIENCE) ________at the forefront of this research admit that their work has been severely criticized. The skeptics in general claim that apes’ language (5. BEHAVE) ________is merely imitative. For this behavior to be called “language”, it must also be (6. COMMUNICATE) ________. The proponents of ape language counter that those who deny the (7. VALID) ________of this research have never worked with apes. They point out that new fields of investigation always create (8. CONTROVERSIAL) ________. They add that (9. HUMAN) ________primates have not been taught to speak, however, because the outer layer of their brain hemispheres is not (10. SUFFICIENT) ________refined.

gấp lắm mg !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Trên cùng 1 nửa mặt phẳng bờ chứa tia Am, vẽ hai tia An và At sao cho: góc mAn=50 độ, góc mAt=100độ a) Tính số đo góc nAt b) Vẽ tia Ay là tia đối của tia Am. Tính góc yAt c) Vẽ đường tròn ( A; 3cm ) đg tròn này cắt tia Am tại N và cắt tia Ay tại M. Tính độ dài MN trình bày cụ thể câu c), còn các câu khác ghi đ/á hoyy cx đc nha, k cần vẽ hình, cảm ơn nhiều

gấp !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!