(3-2v2)(1+v2)^2 = 3(3-2v2) = 9-6v2= v81-v72=v9 = 3

v - знак корня

(3-2 sqrt(2)) (1+ sqrt(2))^2 = (3-2 sqrt(2))(1+2sqrt(2)+2) = (3-2sqrt(2))(3+2sqrt(2)) = 3^2 - (2sqrt(2))^2 = 9 - 4*2 = 1

sqrt - корень