lingo 拿不出正确的解

lingo 拿不出正确的解MIN=500*(t1+16)*z+50*(t2+16)*j;(500*t1*z+35*t2*j)*(1+(a+20*100)*b+((a+20*100)^2)*(b^3)+((a+20*100)^3)*(b^6)+((a+20*100)^4)*(b^10))>=80000000;t1=1;z>=1;j>=1;end出来的答案是t1,t2,z,j都取1的时候,这样不合理啊