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含条件代数式求值是初中代数的一个重要内容.由于给出条件多样,形式多变,解决这类问题需要学生有敏锐观察力,灵活善变的思维能力及较高的解题技巧,故受到国内外竞赛命题者青睐.根据笔者体会,结合近几年国内外竞赛试题,现将这类问题解法介绍几种如下,供同行参考.
Algebraic expression evaluation with conditions is an important content of junior high school algebra. Due to the diversity of conditions and the variety of forms, solving such problems requires students to have keen observation, flexible and changeable thinking skills and higher problem-solving skills. Domestic and foreign contest propositions are favored. According to the author’s experience, combined with the domestic and foreign competition test questions in recent years, these types of problem solving methods are introduced as follows, for reference by peers.