Odpowiedzi

2010-04-15T15:27:35+02:00
3(a-7)+6a=3a-21+6a=9a-21
-2(x-y)+3y=-2x+2y+3y=-2x+5y
2+3(x-2)=2+3x-6=3x-4
-3(x+2y)-4(-y-7)+(-3)(4x-2y+1)=-3x-6y+4y+28-12x+6y-3=-15x+4y
2010-04-15T15:28:11+02:00
3(a-7)+6a=3a-21+6a=9a-21

-2(x-y)+3y=-2x+2y+3y=5y-2x

2+3(x-2)=2+3x-6=3x-4

-3(x+2y)-4(-y-7)+(-3)(4x-2y+1)=-3x-6y+4y+28-12x+6y-3=
=3x-14y+25