在某个区间 ( a , b ) 内,如果 f ′ ( x ) > 0 ,那么函数 y = f ( x ) 在这个区间内( );如果 f ′ ( x ) < 0 ,那么函数 y = f ( x ) 在这个区间内( ).
A.
单调递减 , 单调递增
B.
单调递 增 , 单调递 减
C.
单调递 增 , 单调递 增
D.
单调递 减 , 单调递 减
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