Rút gọn biểu thức : ( x - y + z ) ² + ( z - y ) ² + 2(x - y + 2 ) ( y - z ) Xin cao nhân nào đó làm chi tiết , dễ hiểu , giải thích lun càng tốt ạ

Làm câu với các từ (ko phải câu hỏi) - available (adj) - connection (n) - do expenment (v) - mainly (adv) - is divided. (v) - regularly (adv) - entertain. (v) - instead of (adv) - attact (v) - improve (v) Giúp mình nhé ♥️

tìm các số tự nhiên x và y biết x tren 8 bằng y trên y (trên là gạch ngang ở giữa của 1 phân số)

Giúp mình với ạ! ngày mai mình phải nộp rồi!

giúp mình câu b và câu c là dc nha

giúp mik với ~~~~~ giải thick lun hộ mik ạ <3

Tìm x biết Làm giúp em bài này vs ạ

Tìm giá trị lớn nhất của A=x²+2x+9

Exercise 3: Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. Question 21: Urbanization is the process by which areas grow bigger as more and more people leave the countryside to live in towns and cities. A. rural B. remote C. suburban D. urban Question 22: The new policies include cutting subsidies and trade barriers. A. agriculture B. agricultural C. agriculturalist D. agriculturally Question 23: Rapid urbanization happened during the period of in Europe and North America in the nineteenth and early twentieth centuries. A. industry B. industrial C. industrious D. industrialization Question 24: A lot of people left their home villages for urban areas hoping to find jobs in the rapidly industries in big towns and cities. A. spreading B. expanding C. surrounding D. boarding Question 25: Since 1950s urbanization has become slower in most MEDCs. Now, some of the biggest cities are losing population because people go back to live in rural areas. This is known as A. counter-productivity B. counter-partnership C. counter-urbanization D. counter-effect Question 26: People to urban areas on a massive scale due to lack of resources in rural areas. A. travel B. immigrate C. migrate D. emigrate Question 27: Small farmers find it harder to a living not just because of bad weather conditions such as drought, floods, or storms, but because they can’t compete with large agricultural companies. A. make B. get C. have D. try Question 28: People living in rural areas are also "pulled" to cities, which are known to be places of financial centers, services, and opportunities. A. health B. wealth C. stealth D. heath Question 29: Believing that the standard of living in urban areas will be higher than in rural areas, many people come to the city seeking their A. luck B. opportunity C. fortune D. promotion Question 30: Urbanization has provided job opportunities, higher and better access to health facilities and education. A. wages B. salaries C. pensions D. incomes Question 31: The urban population will continue to grow and it is expected that its will increase to 70% by 2050. A. level B. population C. habitants D. proportion Question 32: MEDCs stands for more developed countries. A. economic B. economical C. economically D. economics Question 33: Thailand's urbanization rate has increased gradually over the past 50 years, bringing and wide-ranging benefits to the country. A. apparent B. apparently C. unapparent D. unapparently Question 34: In terms of economic benefits, the national income statistics have shown that Bangkok and the surrounding areas usually more than 50% of the gross domestic product. A. produce B. create C. generate D. make Question 35: Regarding the social benefits, Bangkok's inhabitants have access to better services and facilities to any other area of the country. A. comparison B. compared C. comparing D. comparative Question 36: In the South, development concentrated on rice cultivation, and nationally, rice and rubber were the main items of export. Question 37: However, urbanization has also resulted in massive problems. A. numerous B. huge C. plentiful D. abundant Question 38: Thousands of migrants live in the modern surrounded by poverty, crime and drugs, and with no hope of getting a job. A. hostages B. mortgages C. slums D. inners Question 39: Traffic is another big problem in the city whose road system is unable to cope with the increasing number of cars. A. congestion B. jam C. rules D. troubles Question 40: The traffic congestion combined with the large concentration of factories has severely affected the air and water . A. standard B. condition C. quality D. quantity Question 41: For more than 20 years, the Vietnamese government has pursued the open-door and continued to woo foreign investment. A. policy B. way C. export D. guideline Question 42: zones are developing rapidly in the urban areas. A. Agricultural B. Organizational C. Industrial D. Industrialized Question 43: After a decade of economic liberalization, Vietnam has seen a dramatic rise in living in urban areas. A. surface B. standards C. levels D. backgrounds Question 44: A is money that is paid by a government or other authority in order to help an industry or business, or to pay for a public service. A. capital B. subsidy C. investment D. salary Question 45: The economic in the U.S in the 1970s had a serious impact on the whole world. A. difficulty B. crisis C. unbalance D. destruction Question 46: Urbanization refers to the population shift from rural to urban areas, "the gradual increase in the of people living in urban areas", and the ways in which each society adapts to the change. A. number B. proportion C. figures D. amount Question 47: Urbanization is relevant to a range of disciplines, including geography, sociology, economics, urban and public health.. A. making B. practicing C. planning D. growing

Hình Thang ABCD cân (AB//CD) có CD=10cm đáy nhỏ = đường cao , đường chéo vuông góc cạnh bên.Tính đường cao của cạnh bên