戳- 麻烦你出题目说清楚点~...81又1/7...你给个空格干嘛...81又1/7=568/7 71又1/6=427/6 61又1/5=306/5 51又1/4=205/4 41又1/3=124/3先化完变成568/7 * 7/8 +427/6 * 6/7+306/5 * 5/6+205/4 * 4/5+124/3 * 3/4=568/8...