Never Make Somebody Your Everything,cause when they're gone,you've got nothing.

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• Never Make Somebody Your Everything,cause when they're gone,you've got nothing.
• Never Make Somebody Your Everything,cause when they're gone,you've got nothing.
• Never Make Somebody Your Everything,cause when they're gone,you've got nothing.
• Never Make Somebody Your Everything,cause when they're gone,you've got nothing.
• 已知集合A＝｛x｜x²－2x－6≤0,x∈R｝
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