函数f(x)=1/4x^4+1/3ax^3-a^2x^2+a^4(a>0).1)求函数的单调区间 2)若函数图像与直线y=1有两个交点,求a的
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![函数f(x)=1/4x^4+1/3ax^3-a^2x^2+a^4(a>0).1)求函数的单调区间 2)若函数图像与直线y=1有两个交点,求a的](/uploads/image/z/1253329-25-9.jpg?t=%E5%87%BD%E6%95%B0f%28x%29%3D1%2F4x%5E4%2B1%2F3ax%5E3-a%5E2x%5E2%2Ba%5E4%28a%3E0%29.1%EF%BC%89%E6%B1%82%E5%87%BD%E6%95%B0%E7%9A%84%E5%8D%95%E8%B0%83%E5%8C%BA%E9%97%B4+2%EF%BC%89%E8%8B%A5%E5%87%BD%E6%95%B0%E5%9B%BE%E5%83%8F%E4%B8%8E%E7%9B%B4%E7%BA%BFy%3D1%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%2C%E6%B1%82a%E7%9A%84)
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