题目

分式与的和为4，则x的值为____． 答案：【答案】3【解析】根据题意列出分式方程,化简求解,检验即可求出x的值.解：由题可知,+=4整理方程得：7-x=4(x-2),解得：x=3经检验：x=3是原方程的根,∴x=3A     In 1961,Obama was born in Hawaii,US. His father was an African and his mother was I a white American. He grew up in Indonesia and HawaⅡ.     When Obama was 10 years old,he was one of the only three black students at his school in HawaⅡ. He felt very different from most other students. White girls wanted to touch his hair. A white boy even asked him what his father was.     “I lkied to them that my father was a Kenyan prince. But I kept asking myself who I am”’ said Obama ,“and nobody believed in me at that time. ”However,37 years later,the boy made history. Obama became the first black president in the US history.     His unusual background made him wonder who he was. He once turned to alcohol to help forget this question.     With the help of his friends,Obama finally turned his life around at college. His hard work made him a star at Harvard. Later,he became the third black senator in US history.    “Obama's success has made Martin Luther King's dream come true. That is： A man should not be by the color of his skin,but he should be judged by the content of his character ,” wrote ABC News.() 1. Obama was born in .   A. Britain   B. America   C. Kenya   D. Indonesia() 2. There was/ were black student (s) at the school where he studied when he was ten.   A. no   B. one   C. two   D. three() 3. Obama became the first black president in US history when he was .   A. 37   B. 38   C. 47   D. 48() 4. Which of the following is TRUE?   A. Obama5 s father was a Kenya prince.   B. Obama once forgot who his father was with the help of alcohol.   C. When he was young,Obama lied and nobody believed in him.   D. Obama changed his college life without his friends’ help or his hard work.() 5. From the passage,we can see that .   A. we could judge a person by the color of his skin   B. we could not judge a person by the content of his character   C. we should not judge a person by the color of his skin   D. we should judge a person by what he did when he was young