联想打印机出现：open the front cover ,thenreplace the toner cartridge with a new one

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• 已知函数f(x)＝1/3x3−ax2+1（a∈R）． （Ⅰ）若曲线y=f（x）在（1，f（1））处的切线与直线x+y+1=0平行，求a的值； （Ⅱ）若a＞0，函数y=f（x）在区间（a，a 2-3）上存在极值，求a的取值范围；