zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的微积分 >

sum from n=1 to infinity of (9n)/(n!)

解答

n = 1 \sum \infty \frac{9 n}{n !}

解答

收敛

求解步骤

n = 1 \sum \infty \frac{9 n}{n !}

使用常数相乘法则:

\sum c \cdot a_{n} = c \cdot \sum a_{n}

= 9 \cdot n = 1 \sum \infty \frac{n}{n !}

使用级数比值审敛法:

收敛

= 9 收敛

= 收敛

流行的例子

limit as x approaches 2 of x^3-3x^2+4

derivative of-4sqrt(x)

integral of 2x(x^2+2)^6

(\partial)/(\partial x)(3x^4y^2-2)