syms x a n[a,n]=vpasolve(0.2*int(x^(n-a-1)*(1-x)^a,x,0,1)==int(x^(n-a)*(1-x)^a,x,0.95,1),0.8*int(x^(n-a-1)*(1-x)^a,x,0,1)==int(x^(n-a)*(1-x)^a,x,0.9,1),a,n)结果是:a = Empty sym: 0-by-1 n = Empty sym: 0-by-1说明,无解。