Toán Lớp 8: ptich thành nhân tử: x^4 – x^2y^2 + y^4
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Toán Lớp 8: ptich thành nhân tử: x^4 – x^2y^2 + y^4
Comments ( 2 )
$=x^4+2x^2y^2+y^4-3x^2y^2$
$=(x^2+y^2)^2-3x^2y^2$
$=(x^2+y^2+\sqrt{3}xy)(x^2+y^2-\sqrt{3}xy)$