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成立,那么x的取值范围是A.x≥-2或x≤2B.-2≤x≤2C.x≥-2D.-2<x<2
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成立,那么x的取值范围是( )
A.x≥-2或x≤2
B.-2≤x≤2
C.x≥-2
D.-2<x<2
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已知
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