题1如图1,在Rt△ABC中,∠ACB=90°,CD上AB,垂足为D,试比较AC+BC与AB+CD的大小。文献[1]用5种方法从不同的角度对题1进行了解析,但笔者一直纠结解法3的“截长法”:既然有了截长法,似乎就应该有“补短法”。但尝试两次都无功而返。于是,笔者翻阅杂志书籍,希望从中能发现破解的蛛丝马迹,还真是众里寻“他”千百度,蓦然回首,解法却在本刊处。 Problem 1 As shown in Figure 1, in Rt △ ABC, ∠ACB = 90 °, AB on the CD, foot drop is D, try to compare the size of AC + BC and AB + CD. The literature [1] used five methods to analyze Problem 1 from different perspectives, but the author has been entangled in the solution of the “Method of Cutoff” of Solution 3: Since there is a method of cutoff, it seems that there should be “ ”. But tried twice without success. As a result, I read the magazine books, hoping to find clues to crack it, really is the public to find “He ” Thousands of degrees, I look back, the solution is in our magazine.