Question

-0,6(4х - 12) + 0,4(5х - 7), если х = 4целых 1/6​

Answer 1

Пошаговое объяснение:

$- 0.6(4x - 12) +0.4(5x - 7) = \\ = - 2.4x + 7.2 + 2x - 2.8 = \\ = - 0.4x + 4.4 \: pri \: x = 4 \frac{1}{6} \\ - 0.4 \times 4 \frac{1}{6} + 4.4 = \\ = - \frac{2}{5} \times \frac{25}{6} + \frac{22}{5} = \\ = - \frac{5}{3} + \frac{22}{5} = \\ = \frac{41}{15} = 2 \frac{11}{15}$