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2 năm trước
A)ab(x-5)-a^2(5-x) B)2a^2(x-y)-4a(y-x) C)a(x-3)-a^2(3-x) D)5x^2y(x-7)-5xy(7-x) E)2xy(a-1)-4x^2y(1-a) F)4a(x-3)-2(3-x) G)x^m+1 - x^m H)x^m+1 + x^m K)x^m+2 - x^m I)x^m+2 + x^m+1
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