Упростите выражение и найдите его значение при x = 0,75: 1 1/9 * (3x - 9) - 2 1/3 * (x - 1,8). 1 2/3 * (x - 6) - 5/9 * (0,6x - 2,7).

1 1/9 * (3x - 9) - 2 1/3 * (x - 1.8) = 10/9 * (3x - 9) - 7/3 * (x - 18/10) = 10/9 * 3x - 10/9 * 9 - 7/3 * x + 7/3 * 18/10 = 10/3x - 10 - 7/3x + 42/10 = 10/3x - 7/3x - 10 + 4.2 = 3/3x - 5.8 = x - 5.8 При x = 0.75: 0. 75 - 5.8 = -5.05 1 2/3 * (x - 6) - 5/9 * (0.6x - 2.7) = 5/3 * (x - 6) - 5/9 * (6/10x - 27/10) = 5/3x - 5/3 * 6 - 5/9 * 6/10x + 5/9 * 27/10 = 5/3x - 10 - 30/90x + 135/90 = 5/3x - 1/3x - 10 + 1.5 = 4/3x - 8.5 При x = 0.75: 4/3 * 0.75 - 8.5 = 4/3 * 3/4 - 8.5 = 1 - 8.5 = -7.5