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若(ax-1)5的展开式中x3的系数是80,则实数a的值是A.-2B.C.D.2
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若(ax-1)
5的展开式中x
3的系数是80,则实数a的值是( )
A.-2
B.
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)
C.
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s+AonZYfRVGmwSEx0RQ+3ntQgSYDAEj1/ILM6q0G/4NEPGRj3LliRTN4ViTcF/I7L2yfekhKlLrt
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)
D.2
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A.-2
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