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题型：填空题 题类：期中考试 难易度：难
设复数\(x= \dfrac{2i}{1-i}(i\)是虚数单位\()\)，则\(C\rlap{^{1}}{_{2 015}}x+C\rlap{^{2}}{_{2 015}}x^{2}+C\rlap{^{3}}{_{2 015}}x^{3}+…+C\rlap{_{2 015}}{^{2 015}}x^{2\;015}=\)____________．
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