Toán Lớp 8: D=x^2-4x-y^2-8y-12
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Toán Lớp 8: D=x^2-4x-y^2-8y-12
phân tích thành nhân tử
Comments ( 2 )
$=x^2-4x+4-y^2-8y-16$
$=(x-2)^2-(y+4)^2$
$=(x-2+y+4)(x-2-y-4)$
$=(x+y+2)(x-y-6)$