一、正楷书写,规范美观。gù zhǔyi riqiong dingliáo ràowǔ meif(x)_2o dian boy=1/x+⋯+⋯+(x+1);(1. x+1/3+⋯+1/3⋯ qing ge man wǔshun xi wanbianfen zhi ta lai ming fu qi shi=1/3 =-1/3 -1/3= 1/2- ...