如图,在平面直角坐标系中,矩形OABC的顶点A(0,3),C(-1,0),将矩形OABC绕原点顺时针旋转90°,得到矩形OA′B′C′.设直线BB′与x轴交于点M、与y轴交于点N,抛物线y=ax2+2x+c的图象经过点C、M、N.
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![如图,在平面直角坐标系中,矩形OABC的顶点A(0,3),C(-1,0),将矩形OABC绕原点顺时针旋转90°,得到矩形OA′B′C′.设直线BB′与x轴交于点M、与y轴交于点N,抛物线y=ax2+2x+c的图象经过点C、M、N.](/uploads/image/z/1620186-42-6.jpg?t=%E5%A6%82%E5%9B%BE%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%E7%9F%A9%E5%BD%A2OABC%E7%9A%84%E9%A1%B6%E7%82%B9A%EF%BC%880%2C3%EF%BC%89%2CC%EF%BC%88-1%2C0%EF%BC%89%2C%E5%B0%86%E7%9F%A9%E5%BD%A2OABC%E7%BB%95%E5%8E%9F%E7%82%B9%E9%A1%BA%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC90%C2%B0%2C%E5%BE%97%E5%88%B0%E7%9F%A9%E5%BD%A2OA%E2%80%B2B%E2%80%B2C%E2%80%B2%EF%BC%8E%E8%AE%BE%E7%9B%B4%E7%BA%BFBB%E2%80%B2%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9M%E3%80%81%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9N%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax2%2B2x%2Bc%E7%9A%84%E5%9B%BE%E8%B1%A1%E7%BB%8F%E8%BF%87%E7%82%B9C%E3%80%81M%E3%80%81N%EF%BC%8E)
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