[中學] 關於三線共點的問題..
如題
已知行列式
|a1 a2 a3|
|b1 b2 b3|=0
|c1 c2 c3|
則平面上三線
a1x+b1y+c1z=0
a2x+b2y+c2z=0
a3x+b3y+c3z=0
交於一點
這是是非題而答案是錯的
老師解釋因為上述行列式=0時也可能三線平行或重合
完全不懂啊啊啊啊啊！
有請版上大神了
爬文數篇還是不懂…
手機排版請見諒…
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