目标函数：z=2.12*(y+10)^2/(x+y+10)+2.12*(y+10)/(x+y+10)-2.54*x+1.90*(x+10)^2/(x+y+10)+1.90*(x+10)/(x+y+10)-1.84*y;
x1,x2取值范围：1.5x1-10<=x2<=2.17x1-10



运行代码：
x1=0:0.1:100;
x2 = linspace(0,100,100);
[x1,x2] = meshgrid(x1,x2);
z = 2.12*(x2+10).^2./(x1+x2+10)+2.12*(x2+10)./(x1+x2+10)-2.54*x1+1.90*(x1+10).^2./(x1+x2+10)+1.90*(x1+10)./(x1+x2+10)-1.84*x2;
z(x2>2.17*x1-10 & x2<1.5*x1-10) = NaN;
figure(1);
mesh(x1,x2,z);