设α,β是方程x2-2mx+1-m2=0 (m∈R)的两个实根,则+的最小值(   )   

α,β是方程x2-2mx+1-m2=0 (m∈R)的两个实根,则+的最小值(   )

    A. -2          B.  0             C.  1            D.  2

答案

C

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