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a,A= 2X^2+Y^2-2XY+X-2Y+2 b, B=x^2+2y^2-2xy+4x-7y+9 c,C=2x^2+4y^2+4xy+2y-2x+3 d, D=2X^2+2Y^2-2XY+2X-1OY+19 TIM GIA TRI NHO NHAT
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