1.若直线l经过点(1,1),且与两坐标轴围成的三角形面积为2,则直线l的条数为( )a.1 b.2 c.3 d.42.ax+by+c=0和2ax+2by+c+1=0表示两条平行直线的充要条件是a2+b2≠0且c≠1.为什么3.(x-y+5)+k(4x-5y-1)=0表示
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![1.若直线l经过点(1,1),且与两坐标轴围成的三角形面积为2,则直线l的条数为( )a.1 b.2 c.3 d.42.ax+by+c=0和2ax+2by+c+1=0表示两条平行直线的充要条件是a2+b2≠0且c≠1.为什么3.(x-y+5)+k(4x-5y-1)=0表示](/uploads/image/z/8620678-46-8.jpg?t=1.%E8%8B%A5%E7%9B%B4%E7%BA%BFl%E7%BB%8F%E8%BF%87%E7%82%B9%EF%BC%881%2C1%EF%BC%89%2C%E4%B8%94%E4%B8%8E%E4%B8%A4%E5%9D%90%E6%A0%87%E8%BD%B4%E5%9B%B4%E6%88%90%E7%9A%84%E4%B8%89%E8%A7%92%E5%BD%A2%E9%9D%A2%E7%A7%AF%E4%B8%BA2%2C%E5%88%99%E7%9B%B4%E7%BA%BFl%E7%9A%84%E6%9D%A1%E6%95%B0%E4%B8%BA%EF%BC%88+%EF%BC%89a.1+b.2+c.3+d.42.ax%2Bby%2Bc%3D0%E5%92%8C2ax%2B2by%2Bc%2B1%3D0%E8%A1%A8%E7%A4%BA%E4%B8%A4%E6%9D%A1%E5%B9%B3%E8%A1%8C%E7%9B%B4%E7%BA%BF%E7%9A%84%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AFa2%2Bb2%E2%89%A00%E4%B8%94c%E2%89%A01.%E4%B8%BA%E4%BB%80%E4%B9%883.%EF%BC%88x-y%2B5%29%2Bk%284x-5y-1%29%3D0%E8%A1%A8%E7%A4%BA)
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