题目

One summer my friend and I decided to go to Italy for a holiday and we decided to travel there without going through a travel agency. You know, you would be submerged (淹没) in crowds of tourists and lose lots of opportunities to get familiar with the country more closely. We started to think over our trip and managed to come up with a free tour of Italy.    The trip was not very long but it was still very impressive. We look forward to going there again! Of course, we spent lots of time arranging the trip, but it was well worth it! Of course I was afraid that something would go wrong and 已知a+b=2，ab=3，则1a+1b= ．