phân tích đa thức sau thành nhân tử :
81x4 + 1 
Xác định các số a và b sao cho x3 + ax2 + 2x + b chia hết cho x2 +x +1.
Tìm a để đa thức 2x3 + 5x - 2x + a chia hết cho đa thức 2x2 -x + 1 
mọi người giúp mình viết cách giải luôn nhé! mình không biết cách giải! Xin cảm ơn trước!

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