已知抛物线y=x²-2kx+3k+4(1)顶点在y轴上时,k的值为___(2)顶点在x轴上时,k的值为___(3)抛物线经过原点时,k的值为___
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![已知抛物线y=x²-2kx+3k+4(1)顶点在y轴上时,k的值为___(2)顶点在x轴上时,k的值为___(3)抛物线经过原点时,k的值为___](/uploads/image/z/7145290-10-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%26%23178%3B-2kx%2B3k%2B4%281%29%E9%A1%B6%E7%82%B9%E5%9C%A8y%E8%BD%B4%E4%B8%8A%E6%97%B6%2Ck%E7%9A%84%E5%80%BC%E4%B8%BA___%282%29%E9%A1%B6%E7%82%B9%E5%9C%A8x%E8%BD%B4%E4%B8%8A%E6%97%B6%2Ck%E7%9A%84%E5%80%BC%E4%B8%BA___%283%29%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87%E5%8E%9F%E7%82%B9%E6%97%B6%2Ck%E7%9A%84%E5%80%BC%E4%B8%BA___)
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已知抛物线y=x²-2kx+3k+4(1)顶点在y轴上时,k的值为___(2)顶点在x轴上时,k的值为___(3)抛物线经过原点时,k的值为___
已知抛物线y=x²-2kx+3k+4
(1)顶点在y轴上时,k的值为___
(2)顶点在x轴上时,k的值为___
(3)抛物线经过原点时,k的值为___
已知抛物线y=x²-2kx+3k+4(1)顶点在y轴上时,k的值为___(2)顶点在x轴上时,k的值为___(3)抛物线经过原点时,k的值为___
(1)0
(2)4或-1
(3)-4/3
(1)顶点在y轴上时,k的值为_0__
(2)顶点在x轴上时,k的值为__-1或4_
(3)抛物线经过原点时,k的值为_-4/3__
y=ax²+bx+c(a≠0)的顶点坐标公式是
(-b/2a,(4ac-b²)/4a)
(1)令x=0
(2)令y=0
(3)令x=y=0
这样就可以解得三个不同条件下的k值了。