[求助]怎么解答这个方程
 

[COLOR=magenta][COLOR=Blue][SIZE=5]怎么解答这个方程啊!!
小弟在此先谢过了[/SIZE][/COLOR][/COLOR]
[COLOR=Magenta][SIZE=5]9.8*(x^2)*log(1-(20*2.9648*4*pi)/(9.8*m))/(2.9648^2*(4*pi)^2)-(20*m)/(2.9648*4*pi)=500[/SIZE][/COLOR]

fzero
fsolve

[B][COLOR="Blue"]这位大哥能说清楚些么,我没用过这两个函数,
谢谢![/COLOR][/B]

回复: [求助]怎么解答这个方程
 

>> syms x m
>> x=solve(9.8*(x^2)*log(1-(20*2.9648*4*pi)/(9.8*m))/(2.9648^2*(4*pi)^2)-(20*m)/(2.9648*4*pi)-500)
这样就得到
x =

25/13601079296/log(1/1225*(1225*m-29648*pi)/m)/pi*2828041497789715429^(1/2)*(log(1/1225*(1225*m-29648*pi)/m)*pi*(25*m+7412*pi))^(1/2)
-25/13601079296/log(1/1225*(1225*m-29648*pi)/m)/pi*2828041497789715429^(1/2)*(log(1/1225*(1225*m-29648*pi)/m)*pi*(25*m+7412*pi))^(1/2)