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P=1/2(3x-2)(2y+4)=1/2(6xy+12x-4y-8) = 6x-2y+3xy - 4
P=(1/2)(3x*2y+3x*4-2*2y-2*4)
P=(1/2)(6xy + 12x - 4y - 8)
P=3xy + 6x - 2y - 4
P=6x + 3xy - 2y - 4
Pole rombu jesr rowne: 6x+3xy - 2y - 4