2/3+(2/3)²+(2/3)³+……+(2/3)的n次方

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2/3+(2/3)²+(2/3)³+……+(2/3)的n次方2/3+(2/3)²+(2/3)³+……+(2/3)的n次方2/3+(2/3)²+(2/3

2/3+(2/3)²+(2/3)³+……+(2/3)的n次方
2/3+(2/3)²+(2/3)³+……+(2/3)的n次方

2/3+(2/3)²+(2/3)³+……+(2/3)的n次方
2-3×﹙2/3)的﹙n+1)次方