Răspuns :
A=(3√2-2√3)²-6√2-(3-√2)²
A=18-12√6+12-6√2-(9-6√2+2)
A=30-12√6-6√2-11+6√2
A=-12√6+19
A=18-12√6+12-6√2-(9-6√2+2)
A=30-12√6-6√2-11+6√2
A=-12√6+19
A=(3√2 - 2√3)(3√2 + 2√3) - √72 - (3 -√2)² ∈ Z
A = (3√2)² - (2√3)² -√36·2 - (9- 2·3·√2 + 2) = 18 - 12 - 6√2 -11 + 6√2 =
= -5 ∈ Z
A = (3√2)² - (2√3)² -√36·2 - (9- 2·3·√2 + 2) = 18 - 12 - 6√2 -11 + 6√2 =
= -5 ∈ Z
