我十分着急,求速解已知函数y=-三分之一x²、y=-三分之一x²+2和y=-三分之一x²-21、分别画出它们的图象4、说出各个图象的开口方向、对称轴和顶点坐标3、试说出y=-三分之一x²+4时
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![我十分着急,求速解已知函数y=-三分之一x²、y=-三分之一x²+2和y=-三分之一x²-21、分别画出它们的图象4、说出各个图象的开口方向、对称轴和顶点坐标3、试说出y=-三分之一x²+4时](/uploads/image/z/7297902-54-2.jpg?t=%E6%88%91%E5%8D%81%E5%88%86%E7%9D%80%E6%80%A5%2C%E6%B1%82%E9%80%9F%E8%A7%A3%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0y%3D-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3B%E3%80%81y%3D-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3B%2B2%E5%92%8Cy%3D-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3B-21%E3%80%81%E5%88%86%E5%88%AB%E7%94%BB%E5%87%BA%E5%AE%83%E4%BB%AC%E7%9A%84%E5%9B%BE%E8%B1%A14%E3%80%81%E8%AF%B4%E5%87%BA%E5%90%84%E4%B8%AA%E5%9B%BE%E8%B1%A1%E7%9A%84%E5%BC%80%E5%8F%A3%E6%96%B9%E5%90%91%E3%80%81%E5%AF%B9%E7%A7%B0%E8%BD%B4%E5%92%8C%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%873%E3%80%81%E8%AF%95%E8%AF%B4%E5%87%BAy%3D-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80x%26%23178%3B%2B4%E6%97%B6)
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