用matlab解题
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用matlab解题
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![用matlab解题](/uploads/image/z/1329232-40-2.jpg?t=%E7%94%A8matlab%E8%A7%A3%E9%A2%98)
1.clear
[x y]=meshgrid(-5:0.01:5);
z=x.^2+y.^2+1;
surf(x,y,z);
zz=min(z)
zzz=min(zz)
2.
clear
syms pa pb
%pa为a市场价格,pb为b市场价格,qa为a市场销售量,qb为b市场销售量
%pa=65-0.5*qa;
qa=(65-pa)/0.5;
%pb=110-3*qb;
qb=(110-pb)/3;
%总的卖出价钱为
sell=pa*qa+pb*qb
%总的销售量为
q=qa+qb;
%成本为
c=1000+9*(q)+0.1*q^2;
%总的收益为
profit=sell-c;
profit1=simplify(profit)
ezsurf(pa,pb,profit1)
axis([0 1000 0 1000 -10000 -3000])
[x y]=meshgrid(-5:0.01:5);
z=x.^2+y.^2+1;
surf(x,y,z);
zz=min(z)
zzz=min(zz)
2.
clear
syms pa pb
%pa为a市场价格,pb为b市场价格,qa为a市场销售量,qb为b市场销售量
%pa=65-0.5*qa;
qa=(65-pa)/0.5;
%pb=110-3*qb;
qb=(110-pb)/3;
%总的卖出价钱为
sell=pa*qa+pb*qb
%总的销售量为
q=qa+qb;
%成本为
c=1000+9*(q)+0.1*q^2;
%总的收益为
profit=sell-c;
profit1=simplify(profit)
ezsurf(pa,pb,profit1)
axis([0 1000 0 1000 -10000 -3000])