sum from n=1 to infinity of 2-8(0.9)^n

解答

n = 1 \sum \infty 2 - 8 (0.9)^{n}

发散

求解步骤

n = 1 \sum \infty 2 - 8 \cdot 0. 9^{n}

使用级数发散判别法:

发散

= 发散

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