题目内容
函数y=的单调递减区间为
(-∞,-3]
(-∞,-1]
[1,+∞)
[-3,-1]
(-∞,1]
[0,2]
[-1,+∞)
函数y=的单调递减区间为( )
A.(-∞,-3] B.(-∞,-1]
C.[1,+∞) D.[-3,-1]
函数y=的单调递减区间为 .