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thanhhien21102001
2 năm trước
Cho a,b,c,d ko bằng 0 và b^2= c.a c^2= b.d Chứng minh : a^3 + b^3+ c^3= a b^3+ c^3 + d^3 d
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On 1st December 1955, a 42-year-old black woman got on a bus to travel home after work. She was from Alabama, USA. Her name was Rosa Parks. (1)_______ Every day, Rosa Parks travelled to and from work by bus. At that time, black people and white people in the south of the USA were not equal. (2) _______. There were separate restaurants, hospitals and schools for white and for black people. On buses, black people had to get on and get off through a different door. They had to sit at the back of the bus, and they had to stand up if a white person wanted to sit down. Or if the bus was full, they sometimes had to get off the bus. On that day in December 1955, Rosa Parks was on the bus on her way home. (3) _______. Some white men got on the bus and the bus driver told Rosa Parks to give her seat to a white man. She politely said no. The driver called the police and they arrested her. The black community decided to take action. They all stopped travelling by bus. (4) _______. This was a big problem for the bus companies, because black people the buses a lot. Rosa Parks’ action was the beginning of important changes in the USA. (5) _______. In 2010 the USA got its first black president. It showed how much changed in 60 years. A. She was at the back in the black section. B. But she began to fight for her rights. C. After a year, the state of Alabama changed the law about black and white people on buses. D. Black people were often not allowed in the same public places as white people. E. They did this for 381 days. F. On that bus and on that day, Rosa Parks did something that changed history.

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