题目

Sarah was ill, she went to see the doctor. “ Doctor, I’m not feeling well,” she said. “ Every time I do my homework, I feel tired. If I go to school on foot, I have to sit down and rest for ten minutes.” The doctor looked at her carefully. At last he said, “ Nothing much. But I’m afraid you are eating too much.” “I don’t understand, what do you mean ? ”asked Sarah. “I mean you eat too much food,” said the doctor. “ Oh! You mean I’m too fat. That’s a problem.” Said Sarah. “What should I do If I don’t want to be heavy !” “ The answer is easy,” said the如图是2002年8月在北京召开的第24届国际数学家大会的会标它是由4个相同的直角三角形拼和而成.若图中大小正方形的面积分别为52和4，则直角三角形的两条直角边的和是      .