Question

Rozwiąż równania

1. x+2/5 -2y =5

x - y+2/6 =3

2. x+y/2 - x/3 = 4

x-y/2 + y/3 = -3

3. 3x-1/5 + 2y-3/4 = 3(y+1)/2

x+y/4 - 3y - 1/2= 3(y+1)/2

Proszę o szybkie i poprawne rozwiązanie. :D

Answer 1

zadanie 1

x+2/5-2y=5

x-y+2/6=3

 

x-2y=5-2/5

x-y=3-2/6

 

x-2y=4 i 3/5

x-y= 2 i 4/6

 

x-2y=23/5

x-y=16/6     /*(-2)

 

x-2y=23/5

-2x+2y= -32/6

.....................

-x=23/5+(-32/6)

-x=138/30-160/30

-x= - 22/30   /*(-1)

x=22/30

 

 

zadanie 2

x+y/2-x/3=4    /*6

x-y/2+y/3= -3   /*6

 

6x-3y-2x=24

6x-3y+2y= -18

 

4x-3y=24

6x-y= -18   / *(-3)

 

4x-3y=24

-18x+3y= 54

......................

-14x=78   /-14

x= -78/14