若函数y=1/3x3-1/2ax2+(a-1)x+1在区间(1,4)内为减函数,在区间(6,+∞)内为增函数试求实数a的取值范围
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![若函数y=1/3x3-1/2ax2+(a-1)x+1在区间(1,4)内为减函数,在区间(6,+∞)内为增函数试求实数a的取值范围](/uploads/image/z/2736244-28-4.jpg?t=%E8%8B%A5%E5%87%BD%E6%95%B0y%3D1%2F3x3-1%2F2ax2%2B%28a-1%29x%2B1%E5%9C%A8%E5%8C%BA%E9%97%B4%EF%BC%881%2C4%EF%BC%89%E5%86%85%E4%B8%BA%E5%87%8F%E5%87%BD%E6%95%B0%2C%E5%9C%A8%E5%8C%BA%E9%97%B4%EF%BC%886%2C%2B%E2%88%9E%29%E5%86%85%E4%B8%BA%E5%A2%9E%E5%87%BD%E6%95%B0%E8%AF%95%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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