如何编写解决这类方程组?- - - - - - - 金宝app,下载188bet金宝搏,金宝搏官方网站

我没能找出被提高到10/9。我使用乱涂乱画代替。

信谊u (r)(右)

信谊N潦草地写真实的

假设(r,“真实”的)

du = diff (u);

dv = diff (v);

left1 = diff (r ^ (n - 1) * du ^ 3)

left1 (r) =

right1 = r ^ (n - 1) * sqrt (u) *倍根号(v) / (3 * r ^ (2/3) * sqrt(1 + 9 *花体^ (10/9)/ (10 * (3 * 2)^ (1/3))))

right1 (r) =

候补委员= diff (r ^ (n - 1) * dv ^ 3)

候补委员(r) =

right2 = r ^ (n - 1) *你* v / (3 * r ^ (2/3)

right2 (r) =

eqn1 = left1 = = right1

eqn1 (r) =

eqn2 =候补委员= = right2

eqn2 (r) =

ic = [u (0) = = 1, v (0) = = 1, du (0) = = 0, dv (0) = = 0)

ic =

索尔= dsolve ([eqn1 eqn2, ic])

警告:无法找到具有象征意义的解决方案。

索尔=(空符号)

字符串(eqn1)

ans =“3 * r ^ (N - 1) * diff (u (r), r) ^ 2 * diff (u (r), r, r) + r ^ (N - 2) * (N - 1) * diff (u (r), r) ^ 3 = = (r ^ (N - 1) * u (r) ^ (1/2) * v (r) ^ (1/2)) / (3 * r ^(2/3) *((9 *花体^ (10/9))/ (10 * (3 * N - 2) ^ (1/3)) + 1) ^ (1/2))”

字符串(eqn2)

ans =“3 * r ^ (N - 1) * diff (v (r), r) ^ 2 * diff (v (r), r, r) + r ^ (N - 2) * (N - 1) * diff (v (r), r) ^ 3 = = (r ^ (N - 1) * u (r) * v (r)) / (3 * r ^ (2/3))”

字符串(集成电路)

ans =1×4字符串数组

“u (0) = = 1”“v(0) = = 1”“潜艇(diff (u (r), r), r, 0) = = 0”“潜艇(diff (v (r), r), r, 0) = = 0 "

缺乏一个象征性的数字解决方案解决方案意味着你将不得不做,但你不能做一个数字解决方案到正无穷,你肯定不会得到一个公式。金宝搏官方网站

如何编写解决这类方程组?

1评论
显示隐藏 None

答案(2)

0评论
显示隐藏1以上的评论

5个评论
显示隐藏 4年长的评论

另请参阅

类别

标签

下载188bet金宝搏

释放

社区寻宝