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方程|1-|1+x||=a只有两个不同的解． (1)a≥2；(2)0＜a＜1．()
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A man once said how useless it was to put advertisements in the newspapers. "Last week," said be, "my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertising, but didn’t get it back.""How did you write your advertisement" asked one of the listeners, a merchant."Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read, "Lost from the City Church last Sunday evening, a black silk umbrella. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street.""Now," said the merchant, "I often advertise, and find that it pays me well. But the way in which an advertisement is expressed is of great importance. Let us try for your umbrella again, and if it fails, I’ll buy you a new one." The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn’t wish to get into trouble, he will return the umbrella to No. 10 Broad Street. He is well known." This appeared in the paper, and on the following morning, the man was astonished when he opened the front door. In the door way lay at least twelve umbrellas of all sizes and colors that had been thrown in, and his own was among the number. Many of them had notes, fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter. Did the merchant know who had taken the umbrella（）
A man once said how useless it was to put advertisements in the newspapers. "Last week," said be, "my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertising, but didn’t get it back.""How did you write your advertisement" asked one of the listeners, a merchant."Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read, "Lost from the City Church last Sunday evening, a black silk umbrella. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street.""Now," said the merchant, "I often advertise, and find that it pays me well. But the way in which an advertisement is expressed is of great importance. Let us try for your umbrella again, and if it fails, I’ll buy you a new one." The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn’t wish to get into trouble, he will return the umbrella to No. 10 Broad Street. He is well known." This appeared in the paper, and on the following morning, the man was astonished when he opened the front door. In the door way lay at least twelve umbrellas of all sizes and colors that had been thrown in, and his own was among the number. Many of them had notes, fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter. This is a story about（）
A man once said how useless it was to put advertisements in the newspapers. "Last week," said be, "my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertising, but didn’t get it back.""How did you write your advertisement" asked one of the listeners, a merchant."Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read, "Lost from the City Church last Sunday evening, a black silk umbrella. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street.""Now," said the merchant, "I often advertise, and find that it pays me well. But the way in which an advertisement is expressed is of great importance. Let us try for your umbrella again, and if it fails, I’ll buy you a new one." The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn’t wish to get into trouble, he will return the umbrella to No. 10 Broad Street. He is well known." This appeared in the paper, and on the following morning, the man was astonished when he opened the front door. In the door way lay at least twelve umbrellas of all sizes and colors that had been thrown in, and his own was among the number. Many of them had notes, fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter. The result of the first advertisement was that()
Word操作题 请对下面的文字进行如下操作： (1)利用用格式刷，使第二段的格式与第一段格式完全相同； (2)统计正文的字符数(包括空格在内)，将答案写在正文后的括号内； (3)将文档的页脚添加页码，居中。 例文： 系统科学 系统科学即以系统思想为中心、综合多门学科的内容而形成的一个新的综合性科学门类。系统科学按其发展和现状，可分为狭义和广义两种。 狭义的系统科学一般是指贝塔朗菲著作《一般系统论：基础、发展和应用》中所提出的将“系统”的科学、数学系统论、系统技术、系统哲学几个方面归纳而成的学科体系。 广义的系统科学包括系统论、信息论、控制论、耗散结构论、协同学、突变论、运筹学、模糊数学、物元分析、泛系方法论、系统动力学、灰色系统论、系统工程学、计算机科学、人工智能学、知识工程学、传播学等一大批学科在内，是20世纪中叶以来发展最快的一大门综合性科学。 正文字数统计( )个字符。
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