小明三次跳绳的次数分别是69下,73下,68下,他的平均成绩是______下.
(69+73+68)÷3,
=210÷2,
=70(下);
答:他的平均成绩是70下.
故答案为:70.
你能根据课本P13 的第二篇电子邮件回答下列问题吗?
1 、Who wrote this e-mail?
____________________________
2 、How many e-mails has Li Ming written today?
___________________________
3 、What is the best way to learn English?
_______________________
4 、What's Li Ming's favourite subject?
__________________________
5 、Who is very good at math?
________________________
价格评估鉴定概述。