Răspuns :
(2√2+3√3-5√5)(√18-√12-√5)=
=2√36 +3√54 -5√90 -2√24-3√36+5√60-2√10-3√15+5√25 =
= 2x6 + 3x3√6-5x3√10-2x2√6 -3x6+5x2√15-2√10-3√15+5x5 =
= 12 + 9√6 - 15√10 - 4√6 - 18 +10√15 - 2√10-3√15 +25 =
= 19 + 5√6 - 17√10 + 7√15
[tex](2 \sqrt{2} + 3 \sqrt{3} - 5 \sqrt{5})( \sqrt{18} - \sqrt{12} - \sqrt{5}) = \\ \\ (2 \sqrt{2} + 3 \sqrt{3} - 5 \sqrt{5}) \times (3 \sqrt{2} - 2 \sqrt{3} - \sqrt{5}) = \\ \\ 12 - 4 \sqrt{6} - 2 \sqrt{10} + 9 \sqrt{6} - 18 - 3 \sqrt{15} - 15 \sqrt{10} + 10 \sqrt{15} + 25 = \\ \\ 19 + 5 \sqrt{6} - 17 \sqrt{10} + 7 \sqrt{15} [/tex]