2х^2-16х=2х^2-3х+2х-6;
-16х+3х-2х=-6;
-15х=-6;
х=6/15;
х=2/5
Ответ:0,4
sin^(4)a+cos^(4)a<=sin^(4)a+cos^(4)a+2sin^(2)acos^(2)a=1-1/2*sin^(2)2<=
<=1-1/2*sin^(2)(П/2)=1-1/2=1/2
функция sin^(2)2a в точке П/4 минимум
(1/3)^2 * (1/3)^3 * ... *(1/3)^25 = (1/3)^(2 + 3 + ... + 25) = (1/3)^((2 + 25) * 24/2) = (1/3)^324
2,5=2 целых и 5/10=2целых и 1/2