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贵刊2004年第8期刊登了冯寅先生的《直线方程四则运算的意义和价值》一文,读后获益非浅.但笔者认为文中例7的解法有所遗漏,忽视了另外两种可能(下文中的(1)、(3)两种情况).同时,原图中A的位置也被标错,应为图2的情形.现将原题摘录和解法重新整理如下:题目已知四条直线l1∶x+3y-
The publication “Meaning and Value of the Linear Equations in the Four Orders” by Mr. Feng Yu published in article No. 8 in 2004. After reading this article, the benefits were significant. However, the author believes that the solution to the example 7 in the text has been omitted, ignoring the other two possibilities. (The following two conditions (1) and (3)). At the same time, the position of A in the original image is also marked as wrong. It should be the case of Fig. 2. The excerpt and solution of the original title are reorganized as follows: Four lines l1:x+3y-