方法1:
>> syms x
>> solve(-87/2/x+1/2*exp(x)*(87+200*x)/x-782/5==0, x)ans =
0.10099792968574978894955689083098
--------------------------
方法2:
fangcheng ='-87/2/x+1/2*exp(x)*(87+200*x)/x-782/5'
>> fzero(fangcheng, 0.3)
ans =
0.1010
>> solve(fangcheng, 0.3)
ans =
0.10099792968574978894955689083098