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ngothihongmenlovely
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b) xy(2x mũ 2 - 3y mũ 2 + 2 phần 3 xy) c) (-3x mũ 2 ) (1 phần 3 x mũ 3 + 2x - 4) d) (7x mũ 3 + 3phần 4x mũ 3 - 2x - 5) (- 2phần 3 x mũ 2)
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