题目

汤姆是你班上的新生，感到非常孤独。请根据表格提示，写一篇短文。简单介绍一下汤姆的问题，并谈谈你给他的建议。要求：意思连贯、语言通顺，词数在70左右。ProblemsSuggestionsMiss his familyCall your parentsHave no friendsTalk to othersKnow little about ChineseAsk…for help Suggestions for Tom___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________求代数式-a2b+（ab2-a2b）-2（ab2-a2b）的值，其中a=6，b=-12．