这两个用程序写的方程，怎么翻译成方程格式形式？

Question

sol1 = NDSolve[{10^10 D[u[t, x], t] == 2* D[u[t, x], x, x],

   u[t, 0] == 0.005,

   u[0, x] == 0, (D[u[t, x], x] /. x -> 0.01) == 0 },

  u, {t, 0, 2*10^6}, {x, 0, 0.01}]

sol2 = NDSolve[{10^10 D[u[t, x], t] ==

    2* D[u[t, x], x, x] - 143*D[u[t, x], x], u[t, 0] == 0.5,

   u[0, x] == 0, (D[u[t, x], x] /. x -> 0.03) == 0 },

  u, {t, 0, 2*10^10}, {x, 0, 0.03}]

Comments

没看懂标题