由题意,当n=1时,有(a-b)(a+b)=a2-b2;当n=2时,有(a-b)(a2+ab+b2)=a3-b3;当n=3时,有(a-b)(a3+a2b+ab2+b3)=a4-b4;当n=4时,有(a-b)(a4+a3b+a2b2+ab3+b4)=a5-b5;所以得到猜想:当n∈N*时,有(a-b)(an+an-1b+…+abn-1+bn)=an-bn;故答案为:(a-b)(an+an-1b+…+abn-1+bn)=an+1-bn+1.