Ta có:
x3-x2-4=x3-2x2+x2-4
=x2(x-2)+(x-2)(x+2)
=(x2+x+2)(x-2)
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Ta có:
x3-x2-4=x3-2x2+x2-4
=x2(x-2)+(x-2)(x+2)
=(x2+x+2)(x-2)
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