Ответ:
(y + 5)² + (y - 3)(у-7)=
=у²+10у+25+у²-7у-3у+21=2у²+46
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Ответ:
(y + 5)² + (y - 3)(у-7)=
=у²+10у+25+у²-7у-3у+21=2у²+46