1.求曲线y=xlnx的平行于直线x-y+1=0的切线方程.2.已知函数f(x)=-x^3+3x^2+9x+a,(1)求f(x)的单调递减区间(2)若f(x)在区间[-2,2]上的最大值为20,求它在该区间上最小值.某厂生产某种产品x件的总成本c(x)=1200+
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![1.求曲线y=xlnx的平行于直线x-y+1=0的切线方程.2.已知函数f(x)=-x^3+3x^2+9x+a,(1)求f(x)的单调递减区间(2)若f(x)在区间[-2,2]上的最大值为20,求它在该区间上最小值.某厂生产某种产品x件的总成本c(x)=1200+](/uploads/image/z/5249458-10-8.jpg?t=1.%E6%B1%82%E6%9B%B2%E7%BA%BFy%3Dxlnx%E7%9A%84%E5%B9%B3%E8%A1%8C%E4%BA%8E%E7%9B%B4%E7%BA%BFx-y%2B1%3D0%E7%9A%84%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B.2.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D-x%5E3%2B3x%5E2%2B9x%2Ba%2C%281%29%E6%B1%82f%28x%29%E7%9A%84%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B4%282%29%E8%8B%A5f%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%5B-2%2C2%5D%E4%B8%8A%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA20%2C%E6%B1%82%E5%AE%83%E5%9C%A8%E8%AF%A5%E5%8C%BA%E9%97%B4%E4%B8%8A%E6%9C%80%E5%B0%8F%E5%80%BC.%E6%9F%90%E5%8E%82%E7%94%9F%E4%BA%A7%E6%9F%90%E7%A7%8D%E4%BA%A7%E5%93%81x%E4%BB%B6%E7%9A%84%E6%80%BB%E6%88%90%E6%9C%ACc%28x%29%3D1200%2B)
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