matlab解方程 结果是F = 0 solve(e^(h*re*exp(1))/(e^((h*re*exp(1))/r) - 1)^r = (1/exp(re*log(e)。。。

关于r，y，h三个参数的微分方程组，这样解不出来：syms r y h
>> F=dsolve('Dr=1/(r^3)-(h+y+r^2)','Dy+y=E*h*Dr/r','Dh=1-e^(E*Dr*h/r)')
结果是：
Warning: Explicit solution could not be found.
> In dsolve at 101

F =

[ empty sym ]
单解最后一个： F=dsolve('Dh=1-e^(E*re*h/r)')
结果是：
F =

0
solve(e^(h*re*exp(1))/(e^((h*re*exp(1))/r) - 1)^r = (1/exp(re*log(e)*(C8 - t)))^exp(1), h)
这是怎么回事？如何解出来关于r，t，E的函数而消去y和h呢