[微積] 微分方程
Solve the differential equation dy/dx = r(M-y)y ,0<y<M
∞ x^n
Find the radius and interval of convergence of the power series Σ -----
n=J n
ln(x^2+y^2)
Evaluate ∫∫ ------------- dxdy ,where D={(x,y):1≦x^2+y^2≦e}
D √(x^2+y^2)
∞ 1
Determine the convergence or divergence of the series Σ -----------
n=2 (√n) ln(n)
Give reasons for your answer
小弟我又來求救了 請大家幫忙
然後第二行那個n=J我實在搞不懂 我在想說會不會是n=1 可是看起來就很像J
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