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/](/uploads/image/z/11588987-11-7.jpg?t=matlab+%E6%B1%82%E7%A7%AF%E5%88%86%3E%3E+syms+x%3E%3E+1.788%2Ax%2F%2825%2Bx%5E2%29%2Aexp%28-%28log%28x%2F20%29%2F0.316%29%5E2%29ans+%3D447%2F250%2Ax%2F%2825%2Bx%5E2%29%2Aexp%28-62500%2F6241%2Alog%281%2F20%2Ax%29%5E2%29%3E%3E+int%28f%2Cx%2C0%2CInf%29Warning%3AExplicit+integral+could+not+be+found.%3E+In+sym.int+at+58ans+%3Dint%28447%2F250%2Ax%2F%2825%2Bx%5E2%29%2A%286121026901143963%2F)
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
>>