min=2*x11+x12+3*x13+x14+2*x15+4*x21+2*x22+x23+3*x24+x25+2*x31+x32+x33+3*x34+4*x35
x11+x12+x13+x14+x15<=600;
x21+x22+x23+x24+x25<=400;
x31+x32+x33+x34+x35<=500;
x11+x21+x31=200;
x12+x22+x32=250;
x13+x23+x33=300;
x14+x24+x34=550;
x15+x25+x35=200;
end
这段程序在Lingo里输入,为什么总显示错误,请高手帮我看一下,如果经核实正确,100分相送!