已知直线l1:5x-2y+3m(3m+1)=0与l2:2x+6y-3m(9m+20)=0,当m为何值时,两直线l1、l2的交点到直线4x-3y-12=0的距离最小?这个最小值是多少?
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![已知直线l1:5x-2y+3m(3m+1)=0与l2:2x+6y-3m(9m+20)=0,当m为何值时,两直线l1、l2的交点到直线4x-3y-12=0的距离最小?这个最小值是多少?](/uploads/image/z/979194-66-4.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl1%3A5x-2y%2B3m%283m%2B1%29%3D0%E4%B8%8El2%3A2x%2B6y-3m%289m%2B20%29%3D0%2C%E5%BD%93m%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E4%B8%A4%E7%9B%B4%E7%BA%BFl1%E3%80%81l2%E7%9A%84%E4%BA%A4%E7%82%B9%E5%88%B0%E7%9B%B4%E7%BA%BF4x-3y-12%3D0%E7%9A%84%E8%B7%9D%E7%A6%BB%E6%9C%80%E5%B0%8F%3F%E8%BF%99%E4%B8%AA%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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