Current location - Training Enrollment Network - Mathematics courses - The whole process of solving the second and third questions in the second volume of the seventh grade mathematics textbook published by People's Education Press.
The whole process of solving the second and third questions in the second volume of the seventh grade mathematics textbook published by People's Education Press.
1, let the average aircraft speed be x km/h and the wind speed be y km/h.

{5/2(x+y)= 1200， 10/3(x-y)= 1200

x=420，y=60

A: The average speed of the plane is 420km/h and the wind speed is 60km/h..

2. Let the average speed be x km/h on the first day and y km/h on the second day.

{5y-4x=2，4x+5y=98

x= 12，y= 10

Answer: the average speed on the first day is 12km/h, and the average speed on the second day is10 km/h.

Related articles
  • The math teaching plan of kindergarten middle class "Where are the neighbors' friends"
  • Is there a big difference between college entrance examination mathematics and undergraduate mathematics?
  • Examination time: the specific time is 2023.
  • What are the simplest basic test sites for liberal arts mathematics in the national college entrance examination?
  • 2022 Southwest Petroleum University Admissions Guide
  • How many ways to prove congruent triangles?
  • Mathematics midterm examination questions in the second volume of the sixth grade of primary school
  • What is the formula for breaking the ten laws?
  • In the sixth question of P58 in Grade 6, Shanghai Education Publishing House found the area of the following shadow part (1) (3).
  • Iff discrete mathematics

    • copyright 2024 Training Enrollment Network All rights reserved