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function F = myfun(x)
F(1)= (3.55e-10)-x(1).*a.*x(2).*(exp(x(3).*298)).^0.5
F(2)= (4.6e-06)-2.*x(3).*2.*(x(1)+x(2).*298)
F(3)= x(1).*x(2)./(x(3).^0.5.*a)
end
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OPT=optimset;
OPT.LargeScale='off';
fun=@myfun;
x0=[];
[x,Y,c,d]=fsolve(fun,x0,OPT);
x

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