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对正整数n,设曲线y=xn(1-x)在x=2处的切线与y轴交点的纵坐标为an,则数列的前n...
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对正整数n,设曲线y=x
n(1-x)在x=2处的切线与y轴交点的纵坐标为a
n,则数列
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Wyt+uTrFHZj+yqbuKf6LXNFe+j7G7SL1xh2fRSzv7YLvjKtCzN//1mBxc+6dsXqgrfeyJt7qW/OR
y1f2+vMzY0+jhkYh3AcGO6tp9ueAKesq+8GoGbLp4aJi6XCbxqHjLNkaj3qK7QFL0eIQ9zqu4QbJ
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pfB4d95DB+TZwfY+HxsZk/D3L5hQsPm/oaQPvrr+Fzao7IZCeKGtAAAAAElFTkSuQmCC
)
的前n项和的公式是 ________.
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对正整数n,设曲线y=xn(1-x)在x=2处的切线与y轴交点的纵坐标为an,则数列
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