题目

对于两个不同的有理数a，b定义一种新的运算如下： ，如 ，那么 =. 答案：【1】1假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词；2. 只允许修改10处，多者（从第11处起）不计分。It is more than two months after our English club was set up by several classmates and me. So far we organized a lot of activities on English learning, such as watching English films, reading classic novels and hold a Christmas party. Every member took a active part in the activities. Many members said the activities benefited us a lot. Not only did they improved their English, but also they brought them a lot of funs. Personally, I think it is real a good idea to set up the club. It is hoped what our club will grow stronger. And we hope more classmates will join in the club.