Question

ajutor va rog nu inteleg ( a si b )

Answer 1

Răspuns:

Explicație pas cu pas:

{x+√2y = 3   I·2 =>

{4x-2√2y = 12

-----

{2x+2√2y = 6  

{4x-2√2y = 12

============

6x = 18 => x = 3

y = (3-x)/√2 = > y = 0

b) {√3x+y = 1-2√3

   {√12x-2y = -√48-2 <=>

  ---------

   {√3x+y = 1-2√3   I·2 =>

   {2√3x -2y = -4√3-2

   ---------

   {2√3x+2y = 2-4√3

   {2√3x -2y = -4√3-2

  ====================

   4√3x = 2-4√3-4√3-2 = -8√3 =>

x = -8√3 : 4√3 => x = -2

y = 1-2√3-√3x = 1-2√3+2√3 => y = 1