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【单选题】

若(1+x)+(1+x)2+…+(1+x)n=A1(x-1)+2A2(x-1)2+…+nAn(x-1)n,则A1+2A2+3A3+…+nAn=()。

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根据网考网移动考试中心的统计,该试题:

5%的考友选择了A选项

3%的考友选择了B选项

62%的考友选择了C选项

30%的考友选择了D选项

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