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G·波利亚在《怎样解题》中说:“画一个假设图形,假设它的各个部分都满足题目条件,也许是迈出解题的重要一步.”《普通高中数学课程标准(实验)》指出:“人们通常采用
G. Polya said in ”How to Solve a Problem“: ”Draw a hypothetical graph. Assuming that each part of it satisfies the condition of the subject, it may be an important step to solve the problem.“ ”Ordinary High School Mathematics Curriculum Standards (“ Experiment) pointed out: ”People usually use