Current location - Training Enrollment Network - Mathematics courses - The new book of mathematics (People's Education Edition) Exercise 8.2, the second question and the fourth answer in the second book of grade seven.
The new book of mathematics (People's Education Edition) Exercise 8.2, the second question and the fourth answer in the second book of grade seven.
Simplified to 4x-y=5? ①

{

? 3x+2y= 12？ ②

①×2 is 8x-2y= 10? ③

②+③ 1 1x=22。

? x=2

Substituting x=2 into ① gives 8-y=5.

? -y=-3

? y=3

∴ x=2

? {

? y=3？

I used addition, subtraction and elimination!

Hope to adopt! ~ thank you?

Related articles
  • How long is the exam?
  • What is the book of Grade 8 in Jieyang, Guangdong?
  • Shang Qi mathematics complete examination paper
  • Southeast University mechanical engineering postgraduate entrance examination experience sharing?
  • What is the failure rate of freshmen in previous years?
  • 20 10 national college entrance examination: is science mathematics difficult?
  • What are the application fields of functional analysis?
  • How to sort out the wrong math problems?
  • Southwestern University of Finance and Economics adjusts the number of places.
  • How to list the third grade by list method

    • copyright 2024 Training Enrollment Network All rights reserved