摘要: It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-emp 阅读全文
posted @ 2019-07-19 18:04 kongbursi 阅读(137) 评论(0) 推荐(0) 编辑
摘要: 转自:https://www.cnblogs.com/simplekinght/p/9218310.html 面积法:若点P在三角形ABC内,则三角形ABP+三角形ACP+三角形BCP的面积等于三角形ABC 已知三角形三点坐标ABC,如何求三角形面积呢? 根据叉乘公式,向量A=(x1,y1) ,向量 阅读全文
posted @ 2019-07-19 08:18 kongbursi 阅读(1928) 评论(0) 推荐(0) 编辑