Toán Lớp 8: tìm m có (x^4-3x^3-6x^2+21x+m):(x^2-3x+1) (phải chia hết) -

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Toán Lớp 8: tìm m có (x^4-3x^3-6x^2+21x+m):(x^2-3x+1) (phải chia hết)