1.х + (х/12) = 65(12х + х)/12 = 6513х = 65 * 1213х = 780х = 780 : 13х = 60ответ А) 607.х(х +2) = 3х²х² + 2х = 3х²3х² - х² - 2х = 02х² - 2х = 02х(х - 1) = 0произведение = 0, если один из множителей =02х = 0х₁ = 0х - 1 = 0х₂ = 1ответ А) 0 ; 1.8.5 - (2х+8)/(х - 2) ÷ 2/(х - 2) = 0ОДЗ : х ≠ 25 - 2(х+4)/(х-2) × (х - 2)/2 = 05 - (х+4) = 05 - х - 4 = 01 - х = 0х = 1ответ А)1.9.7 - (3х + 6)/(х - 5) ÷ 3/(x - 5) = 0ОДЗ : х≠ 57 - 3(х+2)/(х - 5) × (х-5)/3 = 07 - (х + 2) = 07 - х -2 = 05 - х = 0х = 5ответ В) 510.³/₈×х -6 =¹/₅×х +4 ³/₈ × x - ¹/₅× x = 4 +6(¹⁵/₄₀ - ⁸/₄₀) × x = 10⁷/₄₀ × x = 10x = 10÷ ⁷/₄₀ = ¹⁰/₁ × ⁴⁰/₇ = ⁴⁰⁰/₇x = 57 ¹/₇ответ А) 57 ¹/₇15.¹/₂ * (х - 1) + 3х = 30,5(х - 1) + 3х = 30,5х - 0,5 + 3х = 33,5х = 3 +0,53,5х = 3,5х = 1ответ D) 1.16.2x + 3(1- x) = x + 12x + 3 - 3x = x + 1- x + 3 = x + 1- x -x = 1 - 3-2x = - 2x = 1ответ D)120.x(x-1) = 2x²x² - x = 2x² 2x² - x² +x = 0x² + x = 0x(x +1) =0x₁= 0x + 1 = 0x₂ = -1ответ D) - 1; 0 .22.х + (1/х ) = 3 ¹/₃(х² + 1)/х = 10/33(x² + 1) = 10x3x² + 3 = 10x 3x² - 10x + 3 = 0D = (-10)² - 4*3*3 = 100 - 36 = 64= 8²D>0x₁ = ( - (-10) - 8)/(2*3) = (10-8)/6 = 2/6 = 1/3x₂ = ( - (-10) + 8)/(2*3) = (10+8)/6 = 18/6 = 3x₁ < x₂ ⇒ 1/3 < 3 ответ D) 3 .