计算：1-1/3-1/9-1/27-1/81-1/243-1/729

分类: 作业答案 • 2023-01-09 22:27:37

问题描述：

答

1-1/3-1/9-1/27-1/81-1/243-1/729
=1-(1/3+1/9+1/27+1/81+1/243+1/729)
=1-(1/3-1/729x1/3)/(1-1/3)
=1-1/2x728/729
=365/729