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若关于x的不等式|x+1|-|x-2|<a2-4a有实数解,则实数a的取值范围为...
若关于x的不等式|x+1|-|x-2|<a2-4a有实数解,则实数a的取值范围为( )
A.(-∞,1)∪(3,+∞)
B.(1,3)
C.(-∞,-3)∪(-1,+∞)
D.(-3,-1)
考点分析:
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B.
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C.
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D.
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由曲线y=
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B.4
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或-
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