Решение1)Log4(5x+6)=0ОДЗ: 5x + 6 > 0, x > - 6/5, x > - 1 (1/5)5x + 6 = 4°5x + 6 = 15x = - 5x = - 1Ответ: х = - 12) Lg2x+lg(x+3)=lg(12x-4)ОДЗ: x> 0;x + 3 > 0, x > - 312x - 4 > 0, x > 1/3D(y) = (1/3 ; + ∞)Lg (2x)*(x+3) = lg(12x-4)2x(x + 3) = 12x - 42x² + 6x - 12x + 4 = 02x² - 6x + 4 = 0x² - 3x + 2 = 0x1 = 1x2 = 2Ответ: x1 = 1; x2 = 24)Log1/5(7x+1/25)=2ОДЗ: 7x + 1/25 > 07x > - 1/25, x > - 1 / 1757x+1/25 = (1/5)²7x = 1/25 - 1/257x = 0x = 0Ответ: х = 0