1) (a - b) (a +b) = a^ – b^; 2) (a+b)(a^-ab-b^)=a*+b*
3) (a - b)(a + ab + b^) = aº – b°;
4) (а+b)^=a^+ 2 ab+b^
5) (a - b)^ = a^ – 2ab +b^.
3) (a - b)(a + ab + b^) = aº – b°;
4) (а+b)^=a^+ 2 ab+b^
5) (a - b)^ = a^ – 2ab +b^.
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