问题 单项选择题

28.2501只取3位有效数字,结果是()。

A.28.2

B.28.25

C.28.3

D.28.30

答案

参考答案:A

简答题

根据下列情境,写出正确的做法,并说明理由。

(1)你正坐在公交车上,车靠站后上来了一位老大爷。

                                                                                                                                                              

(2)今天轮到你的小组在放学后打扫卫生,电视里刚好要放一部你很想看的动画片。

                                                                                                                                                              

                                                                                                                                                               

(3)老师安排小明等几位同学星期天到学校排练节目,小明却跟父母一道旅游去了,忘记了老师的安排。第二天到校后,小明应该……

                                                                                                                                                              

                                                                                                                                                              

多项选择题