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【简答题】
已知函数f（x）=ax 3 +bx 2 +cx+d（a≠0）的对称中心为M（x 0 ，y 0 ），记函数f（x）的导函数为f′（x），f′（x）的导函数为f″（x），则有f″（x 0 ）=0．若函数f（x）=x 3 -3x 2 ，则 f( 1 2012 )+f( 2 2012 )+…+f( 4022 2012 )+f( 4023 2012 ) =______．
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