题目

A Narrow Escape Shortly after the war, my brother and I were invited to spend a few days’ holiday with an uncle who had just returned from abroad． He had rented a cottage in the country, although he hardly spent much time there. We understood the reason for this after our arrival： the cottage had no comfortable furniture in it. Many of the windows were broken and the roof leaked , making the whole house wet． On our first evening, we sat around the fire after supper listening to the stories our uncle told of his many adventures in distant countries． I was so tired after the long train 若数列{an}的通项an＝，求该数列的前10项的和为________