Question

СРОЧНО!!!
(√7-2√6-√7 +2√6) 2
20 балов​

Answer 1

$( \sqrt{7 - 2 \sqrt{6} } - \sqrt{7 + 2 \sqrt{6} } ) {}^{2} = ( \sqrt{(1 - \sqrt{6} {)}^{2} } - \sqrt{(1 + \sqrt{6} ) {}^{2} } ) {}^{2} = ( \sqrt{6} - 1 - (1 + \sqrt{6} )) {}^{2} = ( \sqrt{6} - 1- 1 - \sqrt{6} ) {}^{2} = ( - 2) {}^{2} = 4$