【求助】方程求解的问题
如吧主所提，之前发的帖子变成仅本人可见了。这是原帖。代码大概只有拿到电脑后才能重新放上。谢谢各位大佬帮忙答疑了！

确认这回可见。

既然简单的算式能解，是否就不是符号太多的缘故？

代码如下
H = ((8 E^((
2 (1 + 2 w) \[Alpha] \[Beta] Sqrt[\[Eta]] + \[Beta]^2 (1 +
4 w + 4 w^2 (1 + \[Eta]^2)) + \[Alpha]^2 (2 +
4 w^2 (-1 + \[Eta])^2 + \[Eta] +
2 w (3 - 5 \[Eta] + 2 \[Eta]^2)))/((-1 +
w (-1 + \[Eta])) (-1 +
2 w (-1 + \[Eta])))) ((1 +
2 w) \[Alpha] Sqrt[\[Eta]] + \[Beta] (1 + 4 w +
4 w^2 (1 + \[Eta]^2))))/((-1 + w (-1 + \[Eta])) (-1 +
2 w (-1 + \[Eta]))) - (
16 E^((\[Beta] (4 w \[Alpha] \[Eta]^(
3/2) + \[Beta] (1 + 4 w + 4 w^2 (1 + \[Eta]^2))))/((-1 +
w (-1 + \[Eta])) (-1 +
2 w (-1 + \[Eta])))) (2 w \[Alpha] \[Eta]^(
3/2) + \[Beta] (1 + 4 w + 4 w^2 (1 + \[Eta]^2))))/((-1 +
w (-1 + \[Eta])) (-1 + 2 w (-1 + \[Eta]))) + (8 E^((
2 \[Alpha] \[Beta] Sqrt[\[Eta]] (-1 +
w (-2 + 4 \[Eta])) + \[Beta]^2 (1 + 4 w +
4 w^2 (1 + \[Eta]^2)) + \[Alpha]^2 (2 +
4 w^2 (-1 + \[Eta])^2 + \[Eta] +
2 w (3 - 5 \[Eta] + 2 \[Eta]^2)))/((-1 +
w (-1 + \[Eta])) (-1 +
2 w (-1 + \[Eta])))) (\[Alpha] Sqrt[\[Eta]] (-1 +
w (-2 + 4 \[Eta])) + \[Beta] (1 + 4 w +
4 w^2 (1 + \[Eta]^2))))/((-1 + w (-1 + \[Eta])) (-1 +
2 w (-1 + \[Eta])))) (-1 + Coth[\[Alpha]^2]);
Solve[H == 0, \[Beta]]
上式除\[Beta]外其他符号都可看作常数。报错Solve::nsmet: This system cannot be solved with the methods available to Solve.

解析解找不出来很正常，建议带入数据求数值解