问题
填空题
小明上学时走上坡路，速度为m千米/时，放学时沿原路返回，速度为n千米/时，则小明上学和放学路上总的平均速度为______千米/时．
答案
依题意得：2÷（
+1 m
）=2÷1 n
=m+n mn
．2mn m+n
故答案为：
．2mn m+n
搜题请搜索小程序“爱下问搜题”
小明上学时走上坡路，速度为m千米/时，放学时沿原路返回，速度为n千米/时，则小明上学和放学路上总的平均速度为______千米/时．
依题意得：2÷（
+1 m
）=2÷1 n
=m+n mn
．2mn m+n
故答案为：
．2mn m+n
A. Room503 B. Room 307 C. Room 201 小题2: The person who teaches Computer is from___________. A. Hangzhou B. Australia C. America 小题3:You may learn about Chinese painting from __________. A. Lucy King B. Mr. Zhang C. Sun Yang 小题4:If you want to stay cool in hot summer and have a good time in water, you can go to the class from______. A .3:00 pm --- 5:00 pm on Sunday B. 2:00 pm --- 4:00 pm on Wed., and Fri. C. 9:00 am ---11:00 am on Thurs. 小题5: When is the Children’s training Center not open? A. Thursday B. Tuesday C. Saturday | ||||||