求证:三条互不平行的直线L1:a1x+b1y+c1=0,直线L2:a2x+b2y+c2=0,只想爱你L3:a3x+b3y+c3=0共点的充要条件是充要条件是矩阵a1 b1 c1(换行)a2 b2 c2 (换行)a3 b3 c3的值为零
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![求证:三条互不平行的直线L1:a1x+b1y+c1=0,直线L2:a2x+b2y+c2=0,只想爱你L3:a3x+b3y+c3=0共点的充要条件是充要条件是矩阵a1 b1 c1(换行)a2 b2 c2 (换行)a3 b3 c3的值为零](/uploads/image/z/10324394-26-4.jpg?t=%E6%B1%82%E8%AF%81%3A%E4%B8%89%E6%9D%A1%E4%BA%92%E4%B8%8D%E5%B9%B3%E8%A1%8C%E7%9A%84%E7%9B%B4%E7%BA%BFL1%3Aa1x%2Bb1y%2Bc1%3D0%2C%E7%9B%B4%E7%BA%BFL2%3Aa2x%2Bb2y%2Bc2%3D0%2C%E5%8F%AA%E6%83%B3%E7%88%B1%E4%BD%A0L3%3Aa3x%2Bb3y%2Bc3%3D0%E5%85%B1%E7%82%B9%E7%9A%84%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AF%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AF%E7%9F%A9%E9%98%B5a1+b1+c1%28%E6%8D%A2%E8%A1%8C%EF%BC%89a2+b2+c2+%28%E6%8D%A2%E8%A1%8C%EF%BC%89a3+b3+c3%E7%9A%84%E5%80%BC%E4%B8%BA%E9%9B%B6)
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