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function []=gs();
A=input(\'ÊäÈëϵÊý¾ØÕó A\');
b=input(\'ÊäÈë¾ØÕób=\');
n=length(A);
B=[A,b];
for i=1:n
    m=abs(B(i,i));l=i;
    for j=(i+1):n
    if abs(B(j,i))>m
        m=abs(B(j,i));
       l=j;
    end
    end
    if l~=i
        temp=B(l,;
        B(l,=B(i,;
        B(i,=temp;
    end
    %ÏûÔª¼ÆËã
        for j=(i+1):n
                mm=B(j,i)/B(i,i);
            for k=i:n   
                B(j,k)=B(j,k)-mm*B(i,k);
            end
        end
        for j=n-1-1):1 %»Ø´ú¼ÆËã
            for k=(j+1):n
                x(n)=B(n,n+1)/B(n,n);
                a1=0;
                a=B(j,k)*x(k);
                a1=a1+a;
                x(j)=B(j,n+1)-a1;
               end
        end
end
disp(\'x=\'),disp(x);
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