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loanloan1120
2 năm trước
Phân tích các đa thức thành nhân tử : a) (2x+1) ^2 -4(x-1)^2 b) (2x+y)^2-4x^2 + 12x - 9 c) (x+1)^2 - 4 (x+1)y^2 +4y^4
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