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笛卡尔说:“我所解决的每一个问题都将成为一个范例,以用于解决其他问题”．我们知道,不等式组{a≥0 a≤0的解集为a=0,巧妙运用这一范例,可轻松解决一类竞赛题．
Descartes said: “Every problem I solve will become an example to solve other problems.” We know that the solution set {a≥0 a≤0 in the inequality group is a=0, which is a clever application of this paradigm and can easily solve a type of competition problem.