求下列二次函数与x轴的交点坐标 (1)y=x²-3x (2) y=3x²-2x-1 (3)y=-6x²-x+1
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![求下列二次函数与x轴的交点坐标 (1)y=x²-3x (2) y=3x²-2x-1 (3)y=-6x²-x+1](/uploads/image/z/2587800-48-0.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E4%BA%A4%E7%82%B9%E5%9D%90%E6%A0%87+%EF%BC%881%EF%BC%89y%3Dx%26%23178%3B-3x+%282%29+y%3D3x%26%23178%3B-2x-1+%EF%BC%883%EF%BC%89y%3D-6x%26%23178%3B-x%2B1)
求下列二次函数与x轴的交点坐标 (1)y=x²-3x (2) y=3x²-2x-1 (3)y=-6x²-x+1
求下列二次函数与x轴的交点坐标 (1)y=x²-3x (2) y=3x²-2x-1 (3)y=-6x²-x+1
求下列二次函数与x轴的交点坐标 (1)y=x²-3x (2) y=3x²-2x-1 (3)y=-6x²-x+1
(1)y=x²-3x
x²-3x =0
x(x-3)=0
x=0或x=3
与x轴的交点坐标为(0,0),(3,0)
(2) y=3x²-2x-1
3x²-2x-1 =0
(x-1)(3x+1)=0
x=1或x=-1/3
与x轴的交点坐标为(1,0),(-1/3,0)
(3)y=-6x²-x+1
-6x²-x+1=0
(2x+1)(-3x+1)=0
x=-1/2或x=1/3
与x轴的交点坐标为(-1/2,0),(1/3,0)
求与x轴交点坐标时,令y=0 与y轴相交 令x=0 (1)y=x²-3x x²-3x =0 x(x-3)=0 x=0或x=3与x轴的交点坐标为(0,0),(3,0) (2) y=3x²-2x-1 3x²-2x-1 =0 (x-1)(3x+1)=0 x=1或x=-1/3与x轴的交点坐标为(1,0),(-1/3,0)(3)y=-6x²...
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求与x轴交点坐标时,令y=0 与y轴相交 令x=0 (1)y=x²-3x x²-3x =0 x(x-3)=0 x=0或x=3与x轴的交点坐标为(0,0),(3,0) (2) y=3x²-2x-1 3x²-2x-1 =0 (x-1)(3x+1)=0 x=1或x=-1/3与x轴的交点坐标为(1,0),(-1/3,0)(3)y=-6x²-x+1 -6x²-x+1=0 (2x+1)(-3x+1)=0 x=-1/2或x=1/3 与x轴的交点坐标为(-1/2,0),(1/3,0)
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