Question

1 1/9(3х-9)-2 1/3(х-1,8) при х=0,75

Answer 1

$1 \frac{1}{9} (3x - 9) - 2 \frac{1}{3} (x - 1.8) = \\ = \frac{10}{ 9} (3x - 9) - \frac{7}{3} (x - 1.8) = \\ = 3 \frac{1}{3} x - 10 - 2 \frac{1}{3} x + 4.2 = \\ = x - 4.8$
при х= 0.75

$x - 4.8 = 0.75 - 4.8 = \\ = - 4.05$
Ответ: - 4.05