(у-2)²=у²-4у+4
(5+а)²=25+10а+а²
(7-х)*(7+х)=49+7х-7х-х²=49-х²
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(у-2)²=у²-4у+4
(5+а)²=25+10а+а²
(7-х)*(7+х)=49+7х-7х-х²=49-х²