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18.(本小題滿分12分)已知函數(shù)f(x) =ax3+bx2+cx+d(x∈R)在x=時取極小值-6,且函數(shù)y=f(x+)的圖象關(guān)于點(diǎn)(-,0)對稱.
(1)求函數(shù)f(x)的解析式:
(2)設(shè)g(x)=10x+m,x∈[-1,1],若對于任意α1∈[-1,1]總存在α 2∈[-1,1],使g(α 2)=f(α1),求實(shí)數(shù)m的取值范圍;