function f=fun2(x)
a=[1.25,8.75,0.5,5.75,3,7.25];
b=[1.25,0.75,4.75,5,6.5,7.25];
 f1 = 0;  % 初始化f1  
 f2 = 0;  % 初始化f2  
for i=1:6
    s=sqrt((a(i)-x(13))^2+(b(i)-x(14))^2);
    f1=x(i)*s+f1;
end
for i=7:12
    s=sqrt((a(i-6)-x(15))^2+(b(i-6)-x(16))^2);
    f2=s*x(i)+f2;
end
f=f1+f2;
end