LINGO分段函数怎么求!sets:position/1..7/:x,f;society/1..15/:r,Y;endsetsdata:r=2 14 3 6 9 4 8 12 10 11 6 14 9 3 6;f=9 6.5 20 14.5 19 13 10.5;enddatamax=@sum(society(i):y(i));Y(1)=@if(x(1)#eq#1,0.7*r(1),0);Y(2)=@if((x(1)+x(2))#le#0,0,@if((x(1)+x(

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