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设S=(x-1)4+4(x-1)3+6(x-1)2+4x-3,则S等于( ) A...
设S=(x-1)4+4(x-1)3+6(x-1)2+4x-3,则S等于( )
A.x4
B.x4+1
C.(x-2)4
D.x4+4
考点分析:
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