题目已知函数f(x)=x3-2xf′(1),则f′(1)的值为( )A. -1B. 1C. -2D. 2已知函数f(x)=x3-2xf′(1),则f′(1)的值为( )A. -1B. 1C. -2D. 2题目解答答案B. 1