紧急求此数学题解答 若详尽再加钱咧设实数a属于[-1,3],函数f(x)=x^2-(a+3)x+2a,当f(x)>1时,实数x的取值范围是( )A.[-1,3] B(-5,+无穷) C.(-无穷,-1)交(5,+无穷) D.(-无穷,1)交(5,+无穷)
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