如图3,在平面直角坐标系中,正方形OABC的边长是2,O为坐标原点,点A在x轴的正半轴上,点C在y轴的正半轴上.一条抛物线经过点A,顶点D是OC的中点.(1)求抛物线的函数表达式;(2)正方形OABC的对角线OB与
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![如图3,在平面直角坐标系中,正方形OABC的边长是2,O为坐标原点,点A在x轴的正半轴上,点C在y轴的正半轴上.一条抛物线经过点A,顶点D是OC的中点.(1)求抛物线的函数表达式;(2)正方形OABC的对角线OB与](/uploads/image/z/3911503-31-3.jpg?t=%E5%A6%82%E5%9B%BE3%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E6%AD%A3%E6%96%B9%E5%BD%A2OABC%E7%9A%84%E8%BE%B9%E9%95%BF%E6%98%AF2%2CO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2C%E7%82%B9A%E5%9C%A8x%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A%2C%E7%82%B9C%E5%9C%A8y%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A.%E4%B8%80%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87%E7%82%B9A%2C%E9%A1%B6%E7%82%B9D%E6%98%AFOC%E7%9A%84%E4%B8%AD%E7%82%B9.%281%29%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%87%BD%E6%95%B0%E8%A1%A8%E8%BE%BE%E5%BC%8F%3B%282%29%E6%AD%A3%E6%96%B9%E5%BD%A2OABC%E7%9A%84%E5%AF%B9%E8%A7%92%E7%BA%BFOB%E4%B8%8E)
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