2^(2x-1) - 7*2^(x-1) + 5 ≤ 0
2^(2х) × 2^(-1) - 7× 2^(x) × 2^(-1) + 5 ≤ 0
(2^х)^2 × 2^(-1) - 7 × 2^(х) × 2^(-1) + 5 ≤ 0
Пусть t=2^x
t^(2) × 1/2 - 7t × 1/2 + 5 ≤ 0 (×2)
t^(2) - 7t +10 ≤ 0
2^(2x-1) - 7*2^(x-1) + 5 ≤ 0
2^(2х) × 2^(-1) - 7× 2^(x) × 2^(-1) + 5 ≤ 0
(2^х)^2 × 2^(-1) - 7 × 2^(х) × 2^(-1) + 5 ≤ 0
Пусть t=2^x
t^(2) × 1/2 - 7t × 1/2 + 5 ≤ 0 (×2)
t^(2) - 7t +10 ≤ 0