dai so lop 8

K

kisihoangtoc

$A=x^4y^2+2y^3x^3+2x^2y^4\sqrt{3}+x^2y^4+2xy^5 \sqrt{3}+3y^6$
$=y^2(x^4+2x^3y+2\sqrt{3}x^2y^2+x^2y^2+2\sqrt{3}xy^3+3y^4)$
$=y^2[(x^2)^2+(xy)^2+(\sqrt{3}y^2)^2+2x^2.xy+2x^2.\sqrt{3}y^2+2.xy.\sqrt{3}y^2]$
$=y^2(x^2+xy+\sqrt{3}y^2)^2$
$=[y(x^2+xy+\sqrt{3}y^2)]^2$
 
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