题目

在中， ，且的面积为，则__________．  答案：【答案】【解析】根据题意， 的面积为： ，则，在中，由余弦定理有： .13、—Lily, you are so special that you seem different from other girls. —Everyone in the world is different . So, just ______. It’s the way of life. A. enjoy yourself   B. be yourself   C. help yourself     D. take care of yourself