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现行统编教材《平面解析几何》３９页例２：已知两条直线：ｌ１：ｘ＋ｍｙ＋６＝０，ｌ２：（ｍ－２）ｘ＋３ｙ＋２ｍ＝０．当ｍ为何值时，ｌ１与ｌ２（ｉ）相交；（ｉ）平行；（ｉｉ）重合．课本中的解法（略）运用了以下结论：设两条直线的方程是ｌ１：Ａ１ｘ＋Ｂ１ｙ＋...
Current textbook “Plane Analytic Geometry” Page 39 Example 2: Known two lines: l1:x+my+6=0, l2:(m-2)x+3y+2m=0. When m is the value, l1 intersects l2(i); (i) Parallel; (ii) Coincidence. The solution in the textbook (slightly) uses the following conclusion: Let the equation of two lines be l1:A1x+B1y+...