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2x(x-4y) - 2y (x+ 3y ) + 3(xy - 1 )= 2x kwadrat - 8xy - 2xy - 6xy + 3xy - 3 =
= 2 x kwadrat - 13xy - 3
(6x + 2) (3y - 4 )= 18xy - 24x + 6y - 8
2(x - 1) + (3x - 2) (x+2)= 2x -2 + 3x kwadrat + 6x - 2x - 4= 9x +3x kwadrat - 6
-(3x-2xy + 5 ) + ( 2x - xy - 4) = -3x + 2xy - 5 +2x -xy -4= -x + xy -9