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function x=newton(fnew,dfnew,x0,delta,maxx)
for k=1:maxx
    x1=x0-fnew(x0)/dfnew(x0);
    err= x1-x0;
    if err<delta;
        break
    end
end
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function y=fnew(x)
y=x^2-0.388*x-0.026-10^6*x^3/(8314*473.15)
end
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function dy=dfnew(x)
dy=2*x-0.388-3*10^6*x^2/(8314*473.15)
end

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f1=@fnew;
f2=@dfnew;
newton(f1,f2,x0,delta,maxx);
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