∵a^2-3a+1=0,b^2-3b+1=0
∴a,b是方程x^2-3x+1=0的两个根
根据韦达定理：a+b=3,ab=1
a²b+ab²=ab(a+b) = 1*3 = 3
1/a+1/b=(a+b)/(ab) = 3/1 = 3