已知抛物线的方程为y＝4x²，则其焦点坐标为？

上一篇：已知sn为等差数列{an}的前n项和S6=51a5=13求数列an 的通向公式

下一篇：已知a＝（3.4）向量AB与a平行且|AB|＝10，点A的坐标是（－1.2），则B的坐标是？

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