max=(0.2727*x-1071)/(1994.7935*A) ; 1.227*x-7282.3<=6556.12*(1+u); A<=2.2*10000*b; A=13750+0.2*x; b=1; !u可调，取0.1—0.6; u=0.5;

Substitute the given values for A, b, and u into the equations:

max=(0.2727*x-1071)/(1994.7935*A)
max=(0.2727*x-1071)/(1994.7935*13750*0.2*x)
max=(0.2727*x-1071)/(549653.125*x)

1.227*x-7282.3<=6556.12*(1 u)
1.227*x-7282.3<=6556.12*(1 0.5)
1.227*x-7282.3<=3278.06
1.227*x<=10560.36
x<=8600.29

A<=2.2*10000*b
13750<=2.2*10000*1
13750<=22000

Therefore, the maximum value of max is:

max=(0.2727*8600.29-1071)/(549653.125*8600.29)
max=0.0000000903

Thus, the maximum value of max is approximately 9.03e-8.