当x>0时,f(x)=5x2+2是( )
设4/(1-x2)·f(x)=d/dx[f(x)]2,且f(0)=0,则f(x)等于:()
函数f(x)=x/(x2-5x+6)展开成(x-5)的级数的收敛区间是()
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