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图象法是一种重要的解题方法,特别是在求方程解的个数时被广泛采用．然而图象法也容易发生以偏概全的错误．第十七届(06年)“希望杯”高一第2试中的第10题就是一道发人深省的好试题．
The image method is an important problem solving method, especially when it is used to solve the number of equations. However, image methods are also prone to partial errors. The 10th question in the second attempt of the 17th (06th) “Hope Cup” Senior One is a thought-provoking question.