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ngochb462
2 năm trước
Bài 3: Phân tích đa thức thành nhân tử 1) $x^{2}$ +4x+4- $9y^{2}$ 2) $5x^{2}$- $45y^{2}$-$30y$-$5$ 3) $x^{3}$+ $6x^{2}$ +6x+1 4) $x^{4}$+ $2x^{3}$ + $x^{2}$
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