Oblicz:
x + 5x – 7x=
3x -0,9 x +2=
2x - 3+ 4x-6=
1-x+4 - 5x – 2y + 6x + y =
4xy – 2x – 3y + 8x - xy - 4x + 2y =
-2x + 8y-(6x-9y)=​


Odpowiedź :

x + 5x – 7x= -x

3x -0,9 x +2= 2,1x + 2

2x - 3+ 4x-6= 6x - 9

1-x+4 - 5x – 2y + 6x + y = 5 - y

4xy – 2x – 3y + 8x - xy - 4x + 2y =

3xy + 2x - y

-2x + 8y-(6x-9y)=​-2x + 8y - 6x + 9y= -8x +17y