首先将mx-y+3=0套进y²-6x-4y+4=0,变成m²x²+(2m-6)x+1=0.
(1)当m=0时,y=3,x=1/6
(2)要有两个实数解,首先m≠0,接着m²x²+(2m-6)x+1=0设成抛物线Y=m²x²+(2m-6)x+1,在X轴上有两个解,开口向上,经过点(0,1),那么顶点【坐标为 (-b/2a,(4ac-b²/4a)】的Y值是负的,将数据套进即得4m²-(2m-6)²/4m²
首先将mx-y+3=0套进y²-6x-4y+4=0,变成m²x²+(2m-6)x+1=0.
(1)当m=0时,y=3,x=1/6
(2)要有两个实数解,首先m≠0,接着m²x²+(2m-6)x+1=0设成抛物线Y=m²x²+(2m-6)x+1,在X轴上有两个解,开口向上,经过点(0,1),那么顶点【坐标为 (-b/2a,(4ac-b²/4a)】的Y值是负的,将数据套进即得4m²-(2m-6)²/4m²