(2√3+√5+7)²= 12+5+49+ 4√15+28√3+14√5. = 66+ 4√15+28√3+14√5.
(3√2-√3+2)² = 18+3+4 -6√6+ 12√6-4√3= 25 - -6√6+ 12√6-4√3
(2+3√2-5√3)² = 4+ 18 + 75 + 12√2 - 20√3 - 30√6= 97 + 12√2 - 20√3 - 30√6
(√2+√3+√7) = 2+3+7+2√6+2√14+2√21 = 12+2√6+2√14+2√21 = 2( 6 + √6+√14+√21)
