(5а+6)²-81=(5а+6-9)×(5а+6+9)=(5а-3)×(5а+15)=(5а-3)×5(а+3)=5(5а-3)×(а+3)
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(5а+6)²-81=(5а+6-9)×(5а+6+9)=(5а-3)×(5а+15)=(5а-3)×5(а+3)=5(5а-3)×(а+3)