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已知函數(shù)在上單調(diào)遞增，則實(shí)數(shù)的取值范圍為   

已知函數(shù)在上單調(diào)遞增，則實(shí)數(shù)的取值范圍是       ．

已知函數(shù)在上單調(diào)遞增，則實(shí)數(shù)的取值范圍是       ．

已知函數(shù)在上單調(diào)遞增，則實(shí)數(shù)的取值范圍是       ．

已知函數(shù)在上單調(diào)遞增，則實(shí)數(shù)的取值范圍是     ;