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[tex]1) 27 a^{2} - a^{5}
2) a^{2} +2ab+ b^{2} -9[/tex]
[tex]1) 27 a^{2} - a^{5}
2) a^{2} +2ab+ b^{2} -9[/tex]
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А²(27-а³)=а²(3-а)(9+3а+а²)(а+в)²-9=(а+в+3)(а+в-3)