(b - 1)^2 - 2b(3b - 1) = b^2 - 2b + 1 - 6b^2 + 2b = b^2 - 6b^2 + 1= -5b^2 + 1.
-5*корень 0.4 + 1 = -5*0.4 + 1 = -2 +1 = -1
ответ: -1
(b - 1)^2 - 2b(3b - 1) = b^2 - 2b + 1 - 6b^2 + 2b = b^2 - 6b^2 + 1= -5b^2 + 1.
-5*корень 0.4 + 1 = -5*0.4 + 1 = -2 +1 = -1
ответ: -1