抛物线y=x²-kx+k,当k=_______时,顶点在x轴上;当k=______时,抛物线过原点,
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![抛物线y=x²-kx+k,当k=_______时,顶点在x轴上;当k=______时,抛物线过原点,](/uploads/image/z/5302091-11-1.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%26%23178%3B-kx%2Bk%2C%E5%BD%93k%3D_______%E6%97%B6%2C%E9%A1%B6%E7%82%B9%E5%9C%A8x%E8%BD%B4%E4%B8%8A%3B%E5%BD%93k%3D______%E6%97%B6%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E8%BF%87%E5%8E%9F%E7%82%B9%2C)
抛物线y=x²-kx+k,当k=_______时,顶点在x轴上;当k=______时,抛物线过原点,
抛物线y=x²-kx+k,当k=_______时,顶点在x轴上;当k=______时,抛物线过原点,
抛物线y=x²-kx+k,当k=_______时,顶点在x轴上;当k=______时,抛物线过原点,
顶点在x轴
则和x轴是一个公共点
所以△=k²-4k=0
k(k-4)+0
所以k=0,k=4
过原点则x=0时y=0
所以0=0-0+k
k=0