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Phân tích các đa thức thành nhân tử a) $x^{3}$ + $9x^{2}$ + 23x + 15 b) ($x^{2}$ + 3x + 1) ($x^{2}$ + 3X – 3) – 5 c) $(3x – 2)^{2}$ (6x – 5) (6x –
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