matlab 求积分>> syms x>> 1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2)ans =447/250*x/(25+x^2)*exp(-62500/6241*log(1/20*x)^2)>> int(f,x,0,Inf)Warning:Explicit integral could not be found.> In sym.int at 58ans =int(447/250*x/(25+x^2)*(6121026901143963/

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matlab 求积分>> syms x>> 1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2)ans =447/250*x/(25+x^2)*exp(-62500/6241*log(1/20*x)^2)>> int(f,x,0,Inf)Warning:Explicit integral could not be found.> In sym.int at 58ans =int(447/250*x/(25+x^2)*(6121026901143963/

matlab 求积分>> syms x>> 1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2)ans =447/250*x/(25+x^2)*exp(-62500/6241*log(1/20*x)^2)>> int(f,x,0,Inf)Warning:Explicit integral could not be found.> In sym.int at 58ans =int(447/250*x/(25+x^2)*(6121026901143963/
matlab 求积分
>> syms x
>> 1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2)
ans =
447/250*x/(25+x^2)*exp(-62500/6241*log(1/20*x)^2)
>> int(f,x,0,Inf)
Warning:Explicit integral could not be found.
> In sym.int at 58
ans =
int(447/250*x/(25+x^2)*(6121026901143963/2251799813685248)^(-62500/6241*log(1/20*x)^2),x = 0 ..Inf)

matlab 求积分>> syms x>> 1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2)ans =447/250*x/(25+x^2)*exp(-62500/6241*log(1/20*x)^2)>> int(f,x,0,Inf)Warning:Explicit integral could not be found.> In sym.int at 58ans =int(447/250*x/(25+x^2)*(6121026901143963/
>> syms x
f=1.788*x/(25+x^2)*exp(-(log(x/20)/0.316)^2);
I=int(f,x,0,inf);
double(I)
ans =
0.9376
>>

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