条件求值问题是初中数学中最常见的题型.由于这类问题形式多样,仅靠基本方法不一定能达到预期的效果,因此,必须针对具体情形,采用灵活多变的方法予以对待.下面就此归纳几种常见的技巧与方法.一、整体代入法例1若xy=a,1x2+1y2=b(b0),则(x+y)2的值为.分析由条件1x2+1y2=b变形后? The problem of conditional evaluation is the most common type of problem in junior high school mathematics. Due to the diversity of these types of problems, basic methods alone may not necessarily achieve the desired results. Therefore, it is necessary to adopt flexible methods to treat specific situations. Several common techniques and methods are summarized here. First, the whole substitution law 1 If xy=a,1x2+1y2=b(b0), then the value of (x+y)2. Analysis is deformed by condition 1x2+1y2=b Rear?