问题 选择题

函数f(x)在区间[-2,3]是增函数,则y=f(x+5)的递增区间是(  )

A.[3,8]

B.[-7,-2]

C.[0,5]

D.[-2,3]

答案

函数y=f(x+5)是函数f(x)向左平移5个单位

∵函数f(x)在区间〔-2,3〕上是增函数

∴y=f(x+5)增区间为(-2,3)向左平移5个单位,即增区间为(-7,-2)

故选B.

综合

读东北地区图,完成下列各题。(共20分)

1、邻国:A       ,B       

2、山脉:①                      

3、临海:C        

4、河流:D        

5、东北地区大部分地处我国地势的第     级阶梯,主要地形类有               

6、东北地区地表结构的基本特征是                                                    

                                                                                   

                                                                                   

7、地理位置一般分为绝对位置和相对位置,运用上图简要评价东北地区的地理位置。

                                                                             

                                                                             

                                                                              

                                                                              

                                                                               

                                                                               

                                                                               

                                                                               

单项选择题