6 - 2 × корень6 × корень 7 + 7
(√6)^2-2*√6*√7+(√7)^2=6-2√42+7=13-2√7
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6 - 2 × корень6 × корень 7 + 7
(√6)^2-2*√6*√7+(√7)^2=6-2√42+7=13-2√7