(√6)² - 2 x √6 x √3 + (√3)² - 1² - (√3)² + 3 x [(√2)² + 2 x 1 x √2 + (1)² ] =
=6 - 2√18 + 3 -1 - 3 + 3 x ( 2 + 2√2 + 1 ) =
=6 - 2√18 + 3 -1-3 + 6 + 6√2 +1=
=6 - 2x(3√2) + 3-1-3+6+6√2 +1=
=6- 6√2+3-1-3+6+6√2+1= (-6√2 si cu 6√2 se simplifica)
=6+3-1-3+6+1=
=12