sum from n=1 to infinity of (10^n)/(n^n)

解答

n = 1 \sum \infty \frac{1 0 ^{n}}{n ^{n}}

收敛

求解步骤

n = 1 \sum \infty \frac{1 0 ^{n}}{n ^{n}}

使用级数根值审敛法:

收敛

= 收敛

\frac{\partial}{\partial x} (e^{x y} + 2 x - 5 y)

y^{^{''}} + 8 y^{^{'}} + 7 y = 0, y (0) = 6, y^{^{'}} (0) = - 1

\frac{d ^{2}}{d x ^{2}} (x^{4} - 6 x^{3})

\frac{\partial}{\partial x} (\frac{7 x}{x ^{2} + y ^{2}})

l a pl a ce t r an s f or m sin (6 (t - \frac{5 π}{6}))