S
satthucaonguyen


=((cho a+b+c=0.Chứng minh rằng:
[TEX] a^3+b^3+a^2 c+b^2 c-abc=o[/TEX]
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[TEX] a^3+b^3+a^2 c+b^2 c-abc=o[/TEX]
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