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“根据已知条件求代数式的值”之类的题目在中考或初中数学竞赛中常常出现。解答这类题目,必须紧抠条件多方面联想。现就初中数学竞赛中的一些题举例说明其解题的思路:
The topic of “resolving algebraic expressions based on known conditions” often appears in the midterm or junior high school math competition. To answer such questions, we must think of conditions in many ways. Here are some examples of the mathematics competition in junior high schools to illustrate their ideas: