在坐标平面内，已知点A（2，-3），那么点A关于x轴的对称点A′的坐标为______，点A关于y轴的对称点A″的坐标为______．
根据关于x轴对称的点，横坐标相同，纵坐标互为相反数；则点A（2，-3）关于x轴的对称点A′的坐标为（2，3）．
再由关于y轴对称的点，纵坐标相同，横坐标互为相反数；则点A（2，-3）关于y轴的对称点A″的坐标为（-2，-3）．
故答案为（2，3），（-2，-3）．
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| Americans think that travel is good for you, some even think it can help one of the country's worst problems-crime. Crime worries a lot of people. Every year, the number of crimes goes 1 . And many criminals are young. They often come from 2 homes, with only one parent or no parents 3 There are many young criminals in prison. 4 prison doesn't change them. Six or seven in ten will 5 to crime when they come out of 6 . One man, Bob Burton, thought of a new 7 . In the old days, young men had to live a(an) 8 life on the road. They learned to be strong and brave, and to help theft friends 9 danger. This helped them to grow into men. 10 Bob Burton started" Vision Quest (用眼睛去寻梦)". 11 takes young criminals on a long, long journey 12 horses and wagons (马车), 3,000 miles through seven states. They were on the 13 for more than a year. The young people on Vision Quest all have 14 problems. Most of them have already spent time in prison. This is their last 15 . It's hard work on the road. The work starts before the sun 16 . The boys and girls have to 17 the horses. Some of them have 18 loved anyone before. But they can love their horse. That love can 19 them to a new life. Not all the young people on Vision Quest will 20 crime behind them. Three or four in ten will one day be in prison again. Bob Burton is right. Travel can be good for you. | ||||
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