如何推导出过两直线交点的直线系方程直线l1 A1x+B1y+C1=0直线l2 A2x+B2y+C2=0然后他们是怎样变化得到A1x+B1y+C1+N(A2X+B2Y+C2)=0的?为什么是不包括I2的直线束?还有能用Z(A1x+B1y+C1)+N(A2X+B2Y+C2)=0表
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![如何推导出过两直线交点的直线系方程直线l1 A1x+B1y+C1=0直线l2 A2x+B2y+C2=0然后他们是怎样变化得到A1x+B1y+C1+N(A2X+B2Y+C2)=0的?为什么是不包括I2的直线束?还有能用Z(A1x+B1y+C1)+N(A2X+B2Y+C2)=0表](/uploads/image/z/7635094-70-4.jpg?t=%E5%A6%82%E4%BD%95%E6%8E%A8%E5%AF%BC%E5%87%BA%E8%BF%87%E4%B8%A4%E7%9B%B4%E7%BA%BF%E4%BA%A4%E7%82%B9%E7%9A%84%E7%9B%B4%E7%BA%BF%E7%B3%BB%E6%96%B9%E7%A8%8B%E7%9B%B4%E7%BA%BFl1+A1x%2BB1y%2BC1%3D0%E7%9B%B4%E7%BA%BFl2+A2x%2BB2y%2BC2%3D0%E7%84%B6%E5%90%8E%E4%BB%96%E4%BB%AC%E6%98%AF%E6%80%8E%E6%A0%B7%E5%8F%98%E5%8C%96%E5%BE%97%E5%88%B0A1x%2BB1y%2BC1%2BN%EF%BC%88A2X%2BB2Y%2BC2%EF%BC%89%3D0%E7%9A%84%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AF%E4%B8%8D%E5%8C%85%E6%8B%ACI2%E7%9A%84%E7%9B%B4%E7%BA%BF%E6%9D%9F%3F%E8%BF%98%E6%9C%89%E8%83%BD%E7%94%A8Z%EF%BC%88A1x%2BB1y%2BC1%EF%BC%89%2BN%EF%BC%88A2X%2BB2Y%2BC2%EF%BC%89%3D0%E8%A1%A8)
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