若函數(shù)f(x)=lg(x²+ax－a－1)在區(qū)間［2,+∞］上單調(diào)遞增,則實數(shù)a的取值范圍是_________.

 

若函數(shù)=x³+ax²+bx-7在R上單調(diào)遞增,則實數(shù)a、b一定滿足的條件是(　　)

    A.a²-3b≤0      B.a²-3b>0

    C.a²-3b=0      D.a²-3b<1

      

若函數(shù)f(x)=lg(x²+ax-a-1)在區(qū)間［2,+∞)上單調(diào)遞增,則實數(shù)a的取值范圍是_________.

若函數(shù)在區(qū)間上單調(diào)遞增, 則實數(shù)a的取值范圍是________

 

若函數(shù)f(x)=lg(x²+ax-a-1)在區(qū)間［2,+∞)上單調(diào)遞增,則實數(shù)a的取值范圍是       .