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viethoang2122
2 năm trước
Phân tích đa thức thành nhân tử: a) 27x³ + 27x² + 9x + 1 + x + 1/3 b) x(x + 1)² + x(x - 5) - 5(x + 1)² c) (a + b + c)³ - (a + b - c)³ - (a - b + c)³ - (-a + b + c)³
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