问题 填空题

某校从8名教师中选派4名教师同时去4个边远地区支教(每地1人),其中甲和乙不同去,甲和丙只能同去或同不去,则不同的选派方案共有______种.

答案

某校从8名教师中选派4名教师同时去4个边远地区支教(每地1人),

其中甲和乙不同去,甲和丙只能同去或同不去,可以分情况讨论,

①甲、丙同去,则乙不去,有C52•A44=240种选法;

②甲、丙同不去,乙去,有C53•A44=240种选法;

③甲、乙、丙都不去,有A54=120种选法,

共有240+240+120=600种不同的选派方案.

故答案为:600.

写作题
暑假将至,John的朋友 Mike邀请他去大连玩,但他已去过两次,并另有安排,请根据提示内容替John给Mike写回信。(要求:字迹工整,语句通顺,条理清楚,字数80字以上)
回信提示内容:
Dalian
Hobby爱好
John’s plan
City
beautiful,clean
John’s
collecting shells
go camping in Australia,visit many cities,
take English lessons there
Weather
not very hot
Activities
swim, play ball games,…
Mike’s
collecting stamps
Dear Mike,
Thank you for                                                                              
                                                                                           
                                                                                           
                                                                                          
                                                                                           
                                                                                           
                                                                                            
Have a good trip!
Yours,
单项选择题 A3/A4型题