Показательное неравенство
1,3² = 1,69 x² - 4x + 2 ≤ 2 x² - 4x ≤ 0 D = b² - 4ac D = (-4)² - 4 * 1 * 0 = 16 x = x = x1 = 4 ; x2 = 0 x ∈ [0 ; 4]