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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
(-∞,-3]
(-∞,-1]
[1,+∞)
[-3,-1]
A.(-∞,-3]
B.(-∞,-1]
C.[1,+∞)
D.[-3,-1)
A.(-∞,-3)
B.(-∞,-1)
C.[1,+∞]
D.[-3,-1]