F(X)在(A,B)内可导,且F(X)的导数<0是F(X)在(A,B)内单调递减的( )条件
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F(X)在(A,B)内可导,且F(X)的导数<0是F(X)在(A,B)内单调递减的( )条件
F(X)在(A,B)内可导,且F(X)的导数<0是F(X)在(A,B)内单调递减的( )条件
F(X)在(A,B)内可导,且F(X)的导数<0是F(X)在(A,B)内单调递减的( )条件
充分不必要
必要的话是《=0