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数列1,(1+2),(1+2+22),…,(1+2+22+…+2n-1)…的前n...
数列1,(1+2),(1+2+22),…,(1+2+22+…+2n-1)…的前n项和为( )
A.2n-1
B.n•2n-n
C.2n+1-n
D.2n+1-2-n
考点分析:
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