.函数f(x)=1/3*a*x^3+1/2*a*x^2-2*a*x+2*a+1的图像经过四个象限充要条件是什么?
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![.函数f(x)=1/3*a*x^3+1/2*a*x^2-2*a*x+2*a+1的图像经过四个象限充要条件是什么?](/uploads/image/z/5195398-22-8.jpg?t=%EF%BC%8E%E5%87%BD%E6%95%B0f%28x%29%3D1%2F3%2Aa%2Ax%5E3%2B1%2F2%2Aa%2Ax%5E2-2%2Aa%2Ax%2B2%2Aa%2B1%E7%9A%84%E5%9B%BE%E5%83%8F%E7%BB%8F%E8%BF%87%E5%9B%9B%E4%B8%AA%E8%B1%A1%E9%99%90%E5%85%85%E8%A6%81%E6%9D%A1%E4%BB%B6%E6%98%AF%E4%BB%80%E4%B9%88%3F)
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