设f(x)=ax^3+bx^2+cx的极小值为-8,其导函数y=f'(x)的图像经过点(-2,0) (2/3,0) ,求解析式我算的方程是64x3a-16b+c=0 -8a+4b-2c=0 (8/27)a+(4/9)b+(2/3)c=0 请问怎么解这三个方程,
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![设f(x)=ax^3+bx^2+cx的极小值为-8,其导函数y=f'(x)的图像经过点(-2,0) (2/3,0) ,求解析式我算的方程是64x3a-16b+c=0 -8a+4b-2c=0 (8/27)a+(4/9)b+(2/3)c=0 请问怎么解这三个方程,](/uploads/image/z/7111252-28-2.jpg?t=%E8%AE%BEf%28x%29%3Dax%5E3%2Bbx%5E2%2Bcx%E7%9A%84%E6%9E%81%E5%B0%8F%E5%80%BC%E4%B8%BA-8%2C%E5%85%B6%E5%AF%BC%E5%87%BD%E6%95%B0y%3Df%27%28x%29%E7%9A%84%E5%9B%BE%E5%83%8F%E7%BB%8F%E8%BF%87%E7%82%B9%28-2%2C0%29+%282%2F3%2C0%29+%2C%E6%B1%82%E8%A7%A3%E6%9E%90%E5%BC%8F%E6%88%91%E7%AE%97%E7%9A%84%E6%96%B9%E7%A8%8B%E6%98%AF64x3a-16b%2Bc%3D0++++++++++++++++++++++++-8a%2B4b-2c%3D0+++++++++++++++++++++++%288%2F27%29a%2B%284%2F9%29b%2B%282%2F3%29c%3D0+++%E8%AF%B7%E9%97%AE%E6%80%8E%E4%B9%88%E8%A7%A3%E8%BF%99%E4%B8%89%E4%B8%AA%E6%96%B9%E7%A8%8B%2C)
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