题目

A friend of mine named Paul received an expensive car from his brother as a Christmas present．On Christmas Eve when Paul came out of his office, a street urchin （顽童）was walking around the shining car．“Is this your car, Paul?” he asked. Paul answered, “Yes, my brother gave it to me for Christmas.” The boy was surprised．“You mean your brother gave it to you and it cost you nothing? Boy, I wish…” He hesitated. Of course Paul knew what he was going to wish for．He wished he had a brother like that．But what the boy said surprised Paul greatly. “I wish,” the （1+2x2）（x-）8的展开式中常数项为     ．