Toán Lớp 8: d, x ³ – 3x ² – 4x + 12
e, x ³ + 3x ² – 3x – 1
f, x ² – 3x + xy – 3y
g, x ² – 2xy + y ² – 4
h, x ² – 2xy + y ² – z ²
i, 3x ² + 6xy + 3y ² – 3z ²
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Toán Lớp 8: d, x ³ – 3x ² – 4x + 12
e, x ³ + 3x ² – 3x – 1
f, x ² – 3x + xy – 3y
g, x ² – 2xy + y ² – 4
h, x ² – 2xy + y ² – z ²
i, 3x ² + 6xy + 3y ² – 3z ²
Comments ( 1 )
=x(x-3) +y(x-3)
=(x-y-2)(x-y+2)
=(x-y)^2 – z^2
=(x-y-z)(x-y+z)
= 3(x^2 +2xy + y^2 -z^2)
=3(x+y-z)(x+y+z)